# Trigonometric Formuals

## Definitions In a right triangle, considering the measure an acute angle call:   sine (sinus) = the cathetus opposite / hypotenuse cosine (cosinus) = the near cathetus / hypotenuse tangent = the opposite cathetus / the near cathetus cotangent = the near cathetus / the opposite cathetus Sine (sinus), cosine, tangent and cotangent are called trigonometric functions and is denoted by sin, cos, tan, and ctg.

 In the above triangle, ABC, we have        ### Simple trigonometric formulas

 Given a right triangle ABC with rectangle A, the following are true relationships: basic trigonometry formula      #### Trigonometric Tables

We do not here only the most popular values of trigonometric functions (table below):

 u 00 300 450 600 900 sin u 0   1 cos u 1   0 tg u 0 1 ∞ ctg u ∞ 1 0

Keywords: Trigonometry. Foreground, trigonometric formulas, sine, cosine, tangent, cotangent.

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