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Co-function Identities

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In this lesson, we will look at co-function identities.

What are the Co-function Identities?
A function f is cofunction of a function g if f(A) = g(B) when A and B are complementary angles.

sin A = cos(90° - A)
cos A = sin(90° - A)
sin A = cos B, if A + B = 90°

sec A = csc(90° - A)
csc A = sec(90° - A)
sec A = csc B, if A + B = 90°

tan A = cot(90° - A)
cot A = tan(90° - A)
tan A = cot B, if A + B = 90°


Cofunction Identities
This video explains the cofunction identities and how to determine cofunctions given a function value. What is a cofunction. Finding the cofunction. Using the cofunction relationship

Cofunction Identities Trig

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