Relations and Functions in Mathematics
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Questions and Answers

Which characteristics does relation R = {(1, 2), (2, 2), (1, 1), (4, 4), (1, 3), (3, 3), (3, 2)} exhibit?

  • R is reflexive and symmetric but not transitive.
  • R is symmetric and transitive but not reflexive.
  • R is reflexive and transitive but not symmetric. (correct)
  • R is an equivalence relation.
  • Which pair belongs to the relation R = {(a, b) : a = b - 2, b > 6}?

  • (2, 4) ∈ R
  • (3, 8) ∈ R (correct)
  • (8, 7) ∈ R
  • (6, 8) ∈ R
  • What type of function is defined by the relation R = {(x, x) : x ∈ ℝ}?

  • Rational function
  • Identity function (correct)
  • Modulus function
  • Polynomial function
  • Which operation is NOT typically used for combining functions?

    <p>Concatenation</p> Signup and view all the answers

    Which of the following statements about relations is correct?

    <p>All equivalence relations are reflexive, symmetric, and transitive.</p> Signup and view all the answers

    What is the principal value of $sin^{-1}(-\frac{1}{2})$?

    <p>-\frac{\pi}{6}</p> Signup and view all the answers

    What is the principal value of $cos^{-1}(\frac{\sqrt{3}}{2})$?

    <p>60</p> Signup and view all the answers

    What is the principal value of $cosec^{-1}(2)$?

    <p>60</p> Signup and view all the answers

    What is the principal value of $tan^{-1}(-\sqrt{3})$?

    <p>-60</p> Signup and view all the answers

    Which of the following statements describes the relation R = {(x, y): 3x - y = 0} in set A = {1, 2, 3,..., 14}?

    <p>It is reflexive, symmetric, and transitive.</p> Signup and view all the answers

    For the relation R = {(x, y): y = x + 5 and x < 4} defined in the set of natural numbers, which is true?

    <p>It is neither reflexive nor symmetric.</p> Signup and view all the answers

    What classification does the relation R = {(a, b): a ≤ b²} in the set of real numbers fall into?

    <p>Neither reflexive, nor symmetric, nor transitive.</p> Signup and view all the answers

    The relation R = {(a, b): b = a + 1} defined in the set {1, 2, 3, 4, 5, 6} is classified as:

    <p>Transitive but not reflexive or symmetric.</p> Signup and view all the answers

    Which of these relations defined in set of integers is described as not symmetric?

    <p>R = {(x, y): x is wife of y}</p> Signup and view all the answers

    Is the function $f: ext{R}^* \rightarrow \text{R}^*$ defined by $f(x) = \frac{1}{x}$ one-to-one?

    <p>Yes, for all values of x in $ ext{R}^*$</p> Signup and view all the answers

    What happens to the injectivity of the function $f: ext{N} \rightarrow ext{N}$ defined by $f(x) = x^2$?

    <p>It is not injective as it maps different inputs to the same output</p> Signup and view all the answers

    Is the function $f: ext{R} \rightarrow ext{R}$ given by $f(x) = [x]$ onto?

    <p>No, it cannot achieve any real number that is not an integer</p> Signup and view all the answers

    For the function $f: ext{Z} \rightarrow ext{Z}$ defined by $f(x) = x^2$, what can be said about its surjectivity?

    <p>It is not surjective because negative integers cannot be achieved</p> Signup and view all the answers

    What is true about the function $f: ext{N} \rightarrow ext{N}$ defined by $f(x) = x^3$?

    <p>It is both injective and surjective</p> Signup and view all the answers

    What is the characterization of the modulus function $f(x) = |x|$ in terms of injectivity and surjectivity?

    <p>It is neither one-one nor onto.</p> Signup and view all the answers

    Which statement about the signum function $f(x)$ is true?

    <p>It can map multiple inputs to the same output.</p> Signup and view all the answers

    For the function $f: R ightarrow R$ defined by $f(x) = 1 + x^2$, which property does it exhibit?

    <p>It is one-one but not onto.</p> Signup and view all the answers

    What is the range of y if sin⁻¹(x) = y?

    <p>0 ≤ y ≤ π</p> Signup and view all the answers

    Is the function $f: N ightarrow N$ defined by $f(n) = rac{n+1}{2}$ if $n$ is odd and $f(n) = rac{n}{2}$ if $n$ is even a bijective function?

    <p>No, it is many-one.</p> Signup and view all the answers

    What is the result of the expression tan⁻¹(√3) - sec⁻¹(-2)?

    <p>2π/3</p> Signup and view all the answers

    For the function $f: A ightarrow B$ defined by $f(x) = \frac{x-3}{x-1}$ with $A = R - {3}$ and $B = R - {1}$, is it one-one and onto?

    <p>Yes, it is both one-one and onto.</p> Signup and view all the answers

    What is the value of cos⁻¹(1/√2)?

    <p>π/4</p> Signup and view all the answers

    What is the result of the expression cot⁻¹(√3)?

    <p>π/3</p> Signup and view all the answers

    How can you express the sum cos⁻¹(1/2) + 2 sin⁻¹(1/2)?

    <p>π/2</p> Signup and view all the answers

    What is the simplest form of $\tan^{-1} \frac{\cos x - \sin x}{\cos x + \sin x}$?

    <p>$\frac{\pi}{4} - x$</p> Signup and view all the answers

    For $\tan^{-1} \frac{x}{\sqrt{a^2 - x^2}}$, what is the simplest interpretation when $0 < x < a$?

    <p>$\sin^{-1}(\frac{x}{a})$</p> Signup and view all the answers

    What is the correct relation for $\tan^{-1}(\frac{1 - \cos x}{1 + \cos x})$ for $0 < x < \pi$?

    <p>$\frac{x}{2}$</p> Signup and view all the answers

    What does $3 \sin x = \sin^{-1} (3x - 4x^3)$ imply about the domain of $x$?

    <p>$x \in [-\frac{1}{2}, \frac{1}{2}]$</p> Signup and view all the answers

    What is the result of $\tan^{-1}(\frac{2\sin^{-1} x}{1 + x^2})$ for $|x| < 1$?

    <p>$\sin^{-1}(x)$</p> Signup and view all the answers

    What is the total number of elements in matrix A?

    <p>12</p> Signup and view all the answers

    Which of the following pairs of indices corresponds to the element -5 in matrix A?

    <p>(3, 3)</p> Signup and view all the answers

    If a matrix has 24 elements, which of the following is NOT a possible order for this matrix?

    <p>5 x 5</p> Signup and view all the answers

    What is the value of a23 in matrix A?

    <p>5</p> Signup and view all the answers

    Which equation can be used to represent the element at position (i, j) in a 2 x 2 matrix where aij = (i + j)² / 2?

    <p>a12 = 1.5</p> Signup and view all the answers

    Which properties does the relation R = {(1, 2), (2, 1)} exhibit?

    <p>Symmetric but neither reflexive nor transitive</p> Signup and view all the answers

    In which of the following relations is R = {(x, y): x and y have the same number of pages} not an equivalence relation?

    <p>Relation based on the genre of the books</p> Signup and view all the answers

    Which set exhibits an equivalence relation with the property R = {(a, b): |a - b| is even}?

    <p>{1, 3, 5} and {2, 4}</p> Signup and view all the answers

    Which relation is NOT an equivalence relation?

    <p>R = {(a, b): a &gt; b}</p> Signup and view all the answers

    In the relation R = {(P, Q): distance of point P from the origin is same as point Q from the origin}, what shape is formed by all related points?

    <p>Circle</p> Signup and view all the answers

    Which of the following triangles are similar among T₁ (3, 4, 5), T₂ (5, 12, 13), and T₃ (6, 8, 10)?

    <p>T₁ and T₃</p> Signup and view all the answers

    What type of relation is represented by R = {(L₁, L₂): L₁ is parallel to L₂}?

    <p>Equivalence relation</p> Signup and view all the answers

    Which example is reflexive and symmetric but not transitive?

    <p>R = {(a, b): a loves b and b loves a}</p> Signup and view all the answers

    Which relation is an example of being transitive but neither reflexive nor symmetric?

    <p>R = {(x, y): x &lt; y}</p> Signup and view all the answers

    What is the value of $ an^{-1}ig( anig( rac{3 heta}{4}ig)ig)$?

    <p>$ rac{3 heta}{4}$</p> Signup and view all the answers

    Which expression represents $ an^{-1}ig( anig( rac{3 heta}{4}ig)ig)$ correctly?

    <p>$ rac{3 heta}{4}$, for $ heta$ in $(- rac{ heta}{2}, rac{ heta}{2})$</p> Signup and view all the answers

    What is the principal value of $ an^{-1}ig( anig( rac{3 heta}{4}ig)ig)$ when $ rac{3 heta}{4}$ exceeds the principal range?

    <p>$ rac{3 heta}{4} - heta$</p> Signup and view all the answers

    The expression $ an^{-1}ig( anig( rac{3 heta}{4}ig)ig)$ relates to which trigonometric property?

    <p>Oddness of tangent</p> Signup and view all the answers

    Evaluate the expression $ an^{-1}ig( anig( rac{3 heta}{4}ig)ig)$. If this angle is negatively expressed, what will be the adequate answer?

    <p>$ rac{3 heta}{4} - heta$</p> Signup and view all the answers

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