After sine, cosine, and tangent, there are only 3 more possible ratios to be made from a triangle. These last relations are the inverse of the respective functions, they are secant (sec), cosecant (csc), and cotangent (cot).

x = The angle x

O = Opposite side of the angle x

A = Adjacent side of the angle x

H = Hypotenuse

sin(x) = O/H

csc(x) = H/O

cos(x) = A/H

sec(x) = H/A

tan(x) = O/A

cot(x) = A/O

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