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Secant and co secant are co functions and complements.
Co functions trig math. 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 b. Cos π 2 θ y 1 sin θ cos left frac pi 2 theta right frac y 1 sin theta.
Sine and cosine are cofunctions because sin θ cos 90 θ secant and cosecant are cofunctions because sec θ csc 90 θ. Sin a cos 90 a. Cot 90 x tan x. Cos 90 x sin x.
Csc 90 x sec x. Sin π 2 θ x 1 cos θ sin left frac pi 2 theta right frac x 1 cos theta sin 2π θ. In this lesson we will look at co function identities. Tan 90 x cot x.
Hence the trigonometric co functions are established as follows.
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