Signs of Trigonometric functions in first quadrant

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.

Sine function

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

$\sin{\theta} > 0$

Cosine function

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

$\cos{\theta} > 0$

Tangent function

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

$\tan{\theta} > 0$

Cotangent function

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

$\cot{\theta} > 0$

Secant function

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

$\sec{\theta} > 0$

Cosecant function

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

$\csc{\theta} > 0$