SOH CAH TOA
The trigonometric functions sine, cosine and tangent can be used to express the relationship between the angle of a right triangle and the lengths of the adjacent side, opposite side and hypotenuse. The meaning of the three functions are:
sine Θ = (length of opposite side / length of hypotenuse)
cosine Θ = (length of adjacent side / length of hypotenuse)
tangent Θ = (length of opposite side / length of adjacent side)
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