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Cosine double-angle formula

Cosine sum and difference identity

Cosine triple-angle formula

Cotangent

Cotangent double-angle formula

Cotangent triple-angle formula

Pythagorean identity

Pythagorean identity (cotangent and cosecant)

Pythagorean identity (tangent and secant)

Secant

Sine double-angle formula

Sine sum and difference identity

Sine triple-angle formula

Tangent

Tangent double-angle formula

Tangent sum and difference identity

Tangent triple-angle formula

Trigonometric functions shifts and periodicity

Trigonometric functions symmetry