Trigonometrical Identities

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Introduction

     The trigonometric ratio's are: Sine, Cosine, Tangent, Cotangent, Secant, and Cosecant.

Some Trigonometrical Identities

     1. sin A = cos (90^o - A).

     2. sin A / cos a = tan A.

     3. tan A x tan (90^o - A) = 1.

     4. sin² A + cos² A = 1.

     5. 1 + tan² A = sec² A.

     6. 1 + cot² A = cosec²A. Where 'A' is the angle.

Summary

     i. The trigonometric ratio's are: Sine, Cosine, Tangent, Cotangent, Secant, and Cosecant.

     ii. sin A = cos (90^o - A).

     iii. sin A / cos a = tan A.