Trig Identities: Full List with Double Angle Formulas
Every trig identity you need: Pythagorean, reciprocal, sum and difference, double angle and half angle formulas, with proofs and worked examples.
Tag: identities
Read article → Trig Identities: Full List with Double Angle Formulas
Integral of sin²(x): x/2 − sin(2x)/4 + C
The integral of sin²(x) is x/2 − sin(2x)/4 + C. Uses the power-reduction identity; includes cos²x, sin²(3x) and definite integrals over [0, π].