Trigonometric substitution
Trigonometric substitution
Lessons
Notes:
Prerequisite: Trigonometry Ratio: “SOHCAHTOA”

a)
$\int \sqrt{9x^2}xdx$

b)
$\int \sqrt{9x^2}dx$


2.
Evaluate the integral (Type A: $\sqrt{a^2x^2}$).

b)
$\int \frac{\sqrt{49x^2}}{x^2}dx$

3.
Evaluate the integral (Type B: $\sqrt{a^2+x^2}$).

b)
$\int \frac{x^3}{(16x^2+25)^{\frac{3}{2}}}dx$