Differentiation Problems in Calculus

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Questions and Answers

Given the function y = tan⁻¹(x) + cot⁻¹(x), what is the derivative dy/dx?

The derivative dy/dx is 0.

If x = a sin θ and y = a cos θ, using the chain rule, what is the expression for dy/dx?

dy/dx = -tan(θ).

Prove that if y = tan⁻¹(x), the relationship (1 + x²) = (1 + y²) holds through implicit differentiation.

Differentiate both sides; confirming that dy/dx = 1/(1 + x²).

How do you differentiate the function f(x) = sin(x) + cos(x) using chain rule?

<p>f'(x) = cos(x) - sin(x).</p> Signup and view all the answers

What is the derivative of the function f(x) = arcsin(x) using the formula for derivatives of inverse trigonometric functions?

<p>The derivative f'(x) = 1/√(1 - x²).</p> Signup and view all the answers

What is the derivative of the function $y = (x^4 + 5x^2 + 6)^{ rac{3}{2}}$ using the chain rule?

<p>$ rac{dy}{dx} = 3(x^4 + 5x^2 + 6)^{ rac{1}{2}}(4x^3 + 10x)$</p> Signup and view all the answers

Find the derivative of $y = (x+1)^{ rac{3}{4}}$ using the chain rule.

<p>$ rac{dy}{dx} = rac{3}{4}(x+1)^{- rac{1}{4}}$</p> Signup and view all the answers

Calculate the derivative of $y = rac{x^3}{ ext{sqrt}(x^3 + 1) - 1}$ using implicit differentiation.

<p>Using quotient and chain rule gives $ rac{dy}{dx} = rac{(3x^2)( ext{sqrt}(x^3 + 1) - 1) - x^3 rac{3x^2}{2 ext{sqrt}(x^3 + 1)}}{( ext{sqrt}(x^3 + 1) - 1)^2}$</p> Signup and view all the answers

Differentiate $ rac{x^3}{1+x^3}$ with respect to $x^3$. What is the result?

<p>$ rac{d}{dx^3} rac{x^3}{1+x^3} = rac{1}{(1+x^3)^2}$</p> Signup and view all the answers

For the implicit function $y - xy - ext{sin}(y) = 0$, find $ rac{dy}{dx}$ where it exists.

<p>$ rac{dy}{dx} = rac{ ext{sin}(y) + y}{x + ext{cos}(y)}$</p> Signup and view all the answers

How do you find the equation of the tangent line to the curve defined by $3x² - 7y² + 14y - 27 = 0$ at a specific point?

<p>You first differentiate the curve implicitly to find $\frac{dy}{dx}$, then evaluate it at the given point to obtain the slope. Finally, use the point-slope form of a line to write the equation of the tangent line.</p> Signup and view all the answers

Differentiate the function $f(x) = (x + 2) \sin x$ with respect to $x$.

<p>Using the product rule, $f'(x) = \sin x + (x + 2) \cos x$.</p> Signup and view all the answers

When differentiating $y = \tan^{-1}(\sin 2x / (1 + \cos 2x))$, what rule do you apply and what is the derivative?

<p>You apply the chain rule and the quotient rule. The derivative is $\frac{2 \cos 2x (1 + \cos 2x) - \sin 2x (–\sin 2x)}{(1 + \cos 2x)^2}$.</p> Signup and view all the answers

Explain how to prove that if $y = \tan (a \tan^{-1} x)$, then $(1 + x²) \frac{dy}{dx} - (1 + y²) \frac{dy}{dx} = 0$.

<p>Differentiate $y$ with respect to $x$, apply the chain rule, and rearrange terms to show that the expression simplifies to zero.</p> Signup and view all the answers

Find $\frac{dy}{dx}$ if $y = \tan^7(2 \tan^{-1}x)$ and provide a brief justification.

<p>Using the chain rule and the power rule, $\frac{dy}{dx} = 4y^2 \frac{1}{(4 + x^2)}$.</p> Signup and view all the answers

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Study Notes

Differentiation Problems

  • The document presents various problems related to differentiation, encompassing different techniques and concepts.
  • The problems involve a diverse range of functions, including trigonometric functions, inverse trigonometric functions, and implicitly defined functions.
  • The problems require the application of differentiation rules like the chain rule, the product rule, and the quotient rule.
  • Differentiation techniques are used to find derivatives of functions and determine equations of tangent lines to curves.
  • Trigonometric identities are utilized to simplify expressions and solve problems.
  • Problems often involve finding the derivative (dy/dx) of functions with respect to x or other variables, such as t or y.
  • Implicit differentiation is applied to find dy/dx when the function is defined implicitly in terms of x.
  • Problems include proving and finding equations involving trigonometric functions and their inverses.

Example Problems

  • Find dy/dx if y = tan(x) + cot⁻¹(x): This problem asks for the derivative of a combination of a trigonometric function and its inverse.
  • If x = a sin θ and y = a cos θ, find dy/dx: This problem involves parametric equations and requires applying the chain rule for substitution.
  • Problems involving y = tan⁻¹(x), and proving equations involving (1 + x²) and (1 + y²): These problems focus on the inverse tangent function and require applying differentiation and trigonometric identities.
  • Problems involving functions including trigonometric functions (sin, cos, tan, cot): These problems involve differentiating trigonometric functions using the chain rule and other rules.
  • Problems dealing with functions including inverse trigonometric functions (arcsin, arccos, arctan): These problems require applying differentiation techniques for inverse trigonometric functions.

General Structure

  • The problems are arranged sequentially, each presented on its own line.
  • The problems are likely part of a notebook or study material for a calculus course.

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