AP Calculus BC / Unit 3: Differentiation: Composite, Implicit, and Inverse Functions
3.4 Differentiating Inverse Trigonometric Functions
Notes
- $\displaystyle \frac{d}{dx}\arcsin x=\frac{1}{\sqrt{1-x^2}}$
- $\displaystyle \frac{d}{dx}\arccos x=-\frac{1}{\sqrt{1-x^2}}$
- $\displaystyle \frac{d}{dx}\arctan x=\frac{1}{1+x^2}$
- Use the chain rule for inside functions.
Practice
$\displaystyle \frac{d}{dx}\arctan x$ at $x=1$ equals:
$\displaystyle \frac{1}{1+1}$.
$\displaystyle \frac{d}{dx}\arcsin(2x)=$
Chain rule factor of 2.
Which derivative is negative?
$\arccos$ is decreasing.
Ready for more? Take the Unit 3 test.