5.3 Reciprocal Functions
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cotangent
the trigonometric ratio of adjacent side over opposite side for an acute angle in a right triangle; the reciprocal of the tangent function
secant
the trigonometric ratio of hypotenuse over adjacent side for an acute angle in a right triangle; the reciprocal of the cosine function
cosecant
the trigonometric ratio of hypotenuse over opposite side for an acute angle in a right triangle; the reciprocal of the sine function