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Signs of trigonometric functions

Table of trigonometric functions (sine, cosine, tangent, cotangent, secant and cosecant) signs in quadrants.

$$\begin{array}{|c|c|c|c|c|} \hline \text{Qr.} & \sin\alpha & \cos\alpha & \tan\alpha & \cot\alpha & \sec\alpha & \text{cosec} \ \alpha \\\hline \text{I} & + & + & + & + & + & + \\\hline \text{II} & + & - & - & - & - & + \\\hline \text{III} & - & - & + & + & - & - \\\hline \text{IV} & - & + & - & - & + & - \\\hline \end{array}$$

Note! To determine sign of the expression we can use calculator with trigonometric functions. This table is helpful when using of calculator is not allowed.

2019-03-03

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