1) Take function that have high power to be as U and differentiate it
2) Replace integral with variable U and du, the integrate it
3) After integrate, replace back U with the original function
Completing The
Square
Basic substitution is not available
To get 1 constant and 1 variable
Trigonometric
Identities
sin2x + cos2x = 1
1 + tan2x = sec2x
1 + cot2x = csc2x
Addition Formulas
cos (A+B) = cos A cos B - sin A sin B
sin (A+B) = sin A cos B + cos A sin B
Double-Angle Formulas
sin 2x = 2 sin x cos x
cos 2x = cos2x - sin2x
Half-Angle Formulas
cos2x = (1 + cos2x)/2
sin2x = (1 - cos2x)/2
Improper
Fraction
Use long division for polynomials
Basic substitution is not available
Separating
Fractions
Applicable when the fractions can be
separated
To get simpler integrand
Multiplying By A Form
of 1
Used to multiply the integral by some term divided by itself
To get simpler integrand
Basic substitution, completing the square, improper fraction, and separating function are not available
Eliminating Square
Roots
Used when have a trigonometric function in the square root
Used when trigonometric functions can be simplified by using
trigonometric identities to a squared trigonometric form
Sketch the graph to solve the absolute integrand
Integration By
Parts
1) Integral u dv = uv - integral v du
A right choose of u by using ILATE
RULE while dv is easy to integrate
I : INVERSE TRIGO / INVERSE HYPERBOLIC
L : LOGARITHMIC / GENERAL LOGARITHMIC
A : ALGEBRAIC
T: TRIGONOMETRIC / HYPERBOLIC
E : EXPONENTIAL / GENERAL EXPONENTIAL
Used when Basic Substitution, Completing the Square,
Trigonometric Identities, Improper Fraction, Separating
Fractions, Multiplying by a Form of 1, and Eliminating
Square Roots do not work