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Questions and Answers
What is the range of the expression $y$ if $1
ightarrow 2 + ext{cos } x
ightarrow 3$?
What is the range of the expression $y$ if $1 ightarrow 2 + ext{cos } x ightarrow 3$?
- [1, 3] (correct)
- [-1, 1]
- [0, 3]
- [0, 1]
If $tan θ = \frac{sin 17° + cos 17°}{cos 17° - sin 17°}$, what is the value of $θ$?
If $tan θ = \frac{sin 17° + cos 17°}{cos 17° - sin 17°}$, what is the value of $θ$?
- 10°
- 20°
- 17°
- 73° (correct)
For the identity $sin θ cos α + cos θ sin α$, which of the following is it equal to?
For the identity $sin θ cos α + cos θ sin α$, which of the following is it equal to?
- sin(θ + α) (correct)
- cos(θ - α)
- tan(θ + α)
- sin(θ - α)
Which of the following describes the value of $-1 ≤ cos x ≤ 1$?
Which of the following describes the value of $-1 ≤ cos x ≤ 1$?
What is the simplified value of $8 cos 10° ⋅ cos 20° ⋅ cos 40°$?
What is the simplified value of $8 cos 10° ⋅ cos 20° ⋅ cos 40°$?
What expression represents the equation given for K?
What expression represents the equation given for K?
What is the method to find the value of AB in relation to BD?
What is the method to find the value of AB in relation to BD?
Which of these correctly describes the number of elements neither in X, Y, nor Z if p elements are outside?
Which of these correctly describes the number of elements neither in X, Y, nor Z if p elements are outside?
When given tan A, which statement is true about K?
When given tan A, which statement is true about K?
What is the meaning of the equation sin(π - (θ + α)) sinθ in this context?
What is the meaning of the equation sin(π - (θ + α)) sinθ in this context?
Which expression is equivalent to tan(3A) according to the provided relationships?
Which expression is equivalent to tan(3A) according to the provided relationships?
What is represented by n(X) + n(Y) + n(Z) - n(X ∩ Y) - n(Y ∩ Z) - n(X ∩ Z) + n(X ∩ Y ∩ Z)?
What is represented by n(X) + n(Y) + n(Z) - n(X ∩ Y) - n(Y ∩ Z) - n(X ∩ Z) + n(X ∩ Y ∩ Z)?
If K is expressed as K = 3 - tan² A, what would happen if tan² A equals 3?
If K is expressed as K = 3 - tan² A, what would happen if tan² A equals 3?
What is the value of $t_{10}$ when $ heta = 45°$?
What is the value of $t_{10}$ when $ heta = 45°$?
If $A = 40°$ and $B = 65°$, what is the measure of angle $C$ in the triangle?
If $A = 40°$ and $B = 65°$, what is the measure of angle $C$ in the triangle?
What is the result of $- ext{(sin}^2 heta + ext{cos}^2 heta)$?
What is the result of $- ext{(sin}^2 heta + ext{cos}^2 heta)$?
Which of the following expressions is equal to $2 ext{sin} heta ext{cos} heta$?
Which of the following expressions is equal to $2 ext{sin} heta ext{cos} heta$?
Given the triangle with angles $A$, $B$, and $C$, which of these statements is correct?
Given the triangle with angles $A$, $B$, and $C$, which of these statements is correct?
What condition must be satisfied for the matrix A to be skew-hermitian?
What condition must be satisfied for the matrix A to be skew-hermitian?
Which of the following matrices is singular?
Which of the following matrices is singular?
How many values of k result in the matrix being singular based on the given equation?
How many values of k result in the matrix being singular based on the given equation?
If A is given as a skew-hermitian matrix, what can be said about its eigenvalues?
If A is given as a skew-hermitian matrix, what can be said about its eigenvalues?
What is the relationship between a hermitian matrix and the expression (A)T + A?
What is the relationship between a hermitian matrix and the expression (A)T + A?
What must be true about the matrix A for (A)T + A to be skew-hermitian?
What must be true about the matrix A for (A)T + A to be skew-hermitian?
What is the characteristic form of the singularity condition for the matrix A presented?
What is the characteristic form of the singularity condition for the matrix A presented?
Given the matrix A, what specific property of A guarantees that (A)T + A is hermitian?
Given the matrix A, what specific property of A guarantees that (A)T + A is hermitian?
If ∠A = 90° in ∆ABC, what are the measures of ∠B and ∠C?
If ∠A = 90° in ∆ABC, what are the measures of ∠B and ∠C?
Which of the following equations represents the relationship between angle measures in triangle ABC?
Which of the following equations represents the relationship between angle measures in triangle ABC?
If b = c in triangle ABC, what can we conclude about angles B and C?
If b = c in triangle ABC, what can we conclude about angles B and C?
What is the value of angle C in triangle ABC if ∠A = 90° and ∠B = 45°?
What is the value of angle C in triangle ABC if ∠A = 90° and ∠B = 45°?
Which expression correctly simplifies to $b \tan^2 y + a = d (1 + \tan y)$?
Which expression correctly simplifies to $b \tan^2 y + a = d (1 + \tan y)$?
What does the equation $\sec^2 θ - \tan^2 θ = 1$ illustrate?
What does the equation $\sec^2 θ - \tan^2 θ = 1$ illustrate?
In the equation $b \tan y + a = d (1 + \tan y)$, what does d represent?
In the equation $b \tan y + a = d (1 + \tan y)$, what does d represent?
What is the result of $t_{12} - t_{2}$ in terms of sine and cosine?
What is the result of $t_{12} - t_{2}$ in terms of sine and cosine?
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Study Notes
Trigonometric Identities and Applications
- Trigonometric Identities:
- Key Equation: sin( π − (θ +α))sinθ = sin(θ + α)sinθ
- Angle Sum Identity: sin(θ + α) = sinθ cosα + cosθ sinα
- Double Angle Identity: tan 2A = 2tan A / (1 − tan2 A)
- Triple Angle Identity: tan 3A = (3tan A − tan3 A) / (1 − 3 tan2 A)
Sets and Counting
- Set Theory:
- n(X): Represents the number of elements in set X.
- n(X ∩ Y): Number of elements common to sets X and Y.
- n(X ∪ Y): Total elements in sets X and Y.
- n(X'): Number of elements not in set X, or the complement of X.
Matrix Properties
- Hermitian Matrix: A matrix A is Hermitian if A = (A)T, where (A)T is the conjugate transpose of A.
- Skew-Hermitian Matrix: A matrix A is skew-Hermitian if A = - (A)T
Solving Equations
- Quadratic Equations:
- To solve for the value of an unknown (typically 'x') in a quadratic equation (ax2 + bx + c = 0), the quadratic formula can be used: x = (-b ± √(b2 − 4ac)) / 2a.
Singular Matrices
- Determinant: For a matrix to be singular, its determinant must be equal to zero.
Geometric Principles in Triangles
- Angles: Angles opposite equal sides in a triangle are equal.
- Angles: The sum of angles in a triangle is 180 degrees.
Evaluating Trigonometric Expressions
- Unit Circle: The unit circle is a circle with a radius of 1 centered at the origin of a coordinate plane. It allows for visual representation of angles and trigonometric functions.
- Trigonometric Values:
- sinθ = y / r, cosθ = x / r, and tanθ = y / x, where (x, y) are the coordinates of a point on the unit circle and r is the radius.
- Angle Properties:
- cos (90° - θ) = sin θ and sin (90° - θ) = cos θ
Other Important Points
- Completing the Square: Technique to solve quadratic equations by manipulate the equation to obtain a perfect square trinomial.
- Solving Trigonometric Equations: Employing key identities and algebraic manipulation to solve for unknown angles.
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