Mathwords: Cofunction Identities

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Cofunction Identities

Trig identities showing the relationship between sine and cosine, tangent and cotangent, and secant and cosecant. The value of a trig function of an angle equals the value of the cofunction of the complement of the angle.

Cofunction Identities, radians

Cofunction Identities, degrees

sin (90° – x) = cos x

cos (90° – x) = sin x

tan (90° – x) = cot x cot (90° – x) = tan x

sec (90° – x) = csc x csc (90° – x) = sec x

this page updated 15-jul-23
Mathwords: Terms and Formulas from Algebra I to Calculus
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