Thursday, January 22, 2009

Secant, cosecant, and cotangent.

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).

Triangle which formulas refer to

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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