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cofunction identities

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 xcot (90° – x) = tan x
 sec (90° – x) = csc xcsc (90° – x) = sec x

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