Trigonometric Equations

Basic Rules:

sine rule

cosine rule

tan(x) = sin(x)/cos(x)

sin²(x) + cos²(x) = 1

sin(x + 90) = cos(x)

sin(x) = -sin(-x) and cos(x) = cos(-x)

sin(90 - x) = cos(x) and cos(90 - x) = sin(x)

Advance Trigonometric Identities:

addition and subtraction formulas for cos(x)

addition and subtraction formulas for sin(x)

addition and subtraction formulas for tan(x)

double angle and half angle formulas for sin(x) and cos(x)

the product formula for sin(x) and cos(x)