The Cosecant, Secant and Cotangent
There are three more trigonometric functions that you need to know. These functions are the cosecant, the secant and the cotangent functions. These are simply the reciprocal of the sine, cosine and tangent functions, respectively.
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The cosecant of x, written csc x, is the reciprocal of the sine of x.
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The secant of x, written sec x, is the reciprocal of the cosine of x. 
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The cotangent of x, written cot x, is the reciprocal of the tangent of x. 
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