**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, degrees | |||

sin (90° – | cos (90° – | |||

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

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

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