The signs of all trigonometric functions are positive in first quadrant of the two dimensional Cartesian coordinate system. Let’s learn how each trigonometric function is positive in first quadrant with an understandable geometric proof.

The sign of sine function in first quadrant of two dimensional space is positive.

$\sin{\theta} > 0$

The sign of cosine function is positive in first quadrant of Bi-dimensional space.

$\cos{\theta} > 0$

The sign of tan function in first quadrant of two dimensional Cartesian coordinate system is positive.

$\tan{\theta} > 0$

The sign of cot function in first quadrant of Bi-dimensional Cartesian coordinate system is positive.

$\cot{\theta} > 0$

The sign of secant function is positive in first quadrant of Bi-dimensional space.

$\sec{\theta} > 0$

The sign of value of cosecant function is positive in in first quadrant of two-dimensional space.

$\csc{\theta} > 0$

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