Trig Identity Formulas

The fundamental trigonometry identities that make everything go round

• sin²(x) + cos²(x) = 1 Read more
• cos(x) = 1 - sin²(x) Derivation
• sin(x) = ±√(1 - cos²(x)) Solve for x
• cos(x) = ±√(1 - sin²(x)) Inverse cosine