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Learn basic integration rules by manipulating integrals to fit rules. Find derivative of u, take antiderivatives, and replace u with original function. Follow examples to understand integration better. Practice problems included.
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F.1 Basic Integration Rules
This Section is basically using your integration rules and manipulating whatever it is they are asking to fit one of the rules.
Integral Rules made simple • Let u equal the most complicated part of your integral. • Then find derivative of u with respect to x • Then replace what you have in your integral • Take antiderivatives • Replace u with your original function
Example 1 • dt Let u = t-9, so = 1, therefore du = dt • dt = dt (When finding antiderivative for power rule, add one and divide by that number) = 2 ( = + C =
Example 2 • let u = 3x, so = 3, therefore du = 3dx = du = = 1/3 goes in front to account for the 3 in du = 3dx
Example 3 • Let u = x² + 9. Then = 2x, therefore du = 2x dx • = = du = 2ln + C = 2ln(x²+9) + C
Example 4 • Let u = ln(sinx) then du = dx = cotxdx • = + C • = [ln(sinx)]² + C
HW • Pg. 522 • #15, 17, 21, 25, 29, 33