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reciprocal trigonometric functions

Cosecant, secant, and cotangent — 1 divided by sine, cosine, and tangent.

The reciprocal trigonometric functions — cosecant, secant, and cotangent — aren't new ratios; each is $1$ divided by one of sine, cosine, or tangent: $\csc\theta=\frac{1}{\sin\theta}$ , $\sec\theta=\frac{1}{\cos\theta}$ , $\cot\theta=\frac{1}{\tan\theta}$ .

See also

trigonometric ratios

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