Table of contents

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0. Functions7h 52m
1. Limits and Continuity2h 2m
2. Intro to Derivatives1h 33m
3. Techniques of Differentiation3h 18m
4. Applications of Derivatives2h 38m
5. Graphical Applications of Derivatives6h 2m
6. Derivatives of Inverse, Exponential, & Logarithmic Functions2h 37m
7. Antiderivatives & Indefinite Integrals1h 26m
8. Definite Integrals4h 44m
9. Graphical Applications of Integrals2h 27m
- Area Between Curves
  1h 18m
- Introduction to Volume & Disk Method
  1h 8m
10. Physics Applications of Integrals 3h 16m
- Kinematics
  1h 13m
- Work
  2h 3m
11. Integrals of Inverse, Exponential, & Logarithmic Functions2h 34m
12. Techniques of Integration7h 39m
13. Intro to Differential Equations2h 55m
14. Sequences & Series5h 36m
15. Power Series2h 19m
- Introduction to Power Series
  1h 9m
- Taylor Series & Taylor Polynomials
  1h 10m
16. Parametric Equations & Polar Coordinates7h 58m

2. Intro to Derivatives

Derivatives as Functions

Calculus

2. Intro to Derivatives

Derivatives as Functions

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Multiple Choice

Find the derivative of the function: $y = arctan \frac{1 + x}{1 - x}$ . Which of the following is correct?

\frac{2 x}{1 + x^{2}}

\frac{1 - x^{2}}{(1 + x^{2}) 2}

\frac{1}{1 + x^{2}}

\frac{2}{1 + x^{2}}

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Verified step by step guidance

Step 1: Recall the derivative formula for the arctan function. If y = arctan(u), then dy/dx = (du/dx) / (1 + u^2). Here, u = (1 + x) / (1 - x).

Step 2: Compute the derivative of u = (1 + x) / (1 - x) using the quotient rule. The quotient rule states that if u = f(x)/g(x), then du/dx = [f'(x)g(x) - f(x)g'(x)] / [g(x)]^2.

Step 3: Apply the quotient rule to u = (1 + x) / (1 - x). Let f(x) = 1 + x and g(x) = 1 - x. Compute f'(x) = 1 and g'(x) = -1. Substitute these into the quotient rule formula.

Step 4: Simplify the result from Step 3 to find du/dx. Then substitute du/dx into the derivative formula for arctan: dy/dx = (du/dx) / (1 + u^2).

Step 5: Simplify the expression for dy/dx by substituting u = (1 + x) / (1 - x) into (1 + u^2) and combining terms. This will yield the derivative of y = arctan((1 + x) / (1 - x)).