Question

Answer the following:

Find the trigonometric functions of :

90°

Answer 1

Angle of measure 90° :

Let m∠XOA = 90°

Its terminal arm (ray OA) intersects the standard unit circle at P(0, 1).

∴ x = 0 and y = 1

sin 90° = y = 1

cos 90° = x = 0

tan 90° = `y/x = 1/0`, which is not defined

cosec 90° = `1/y = 1/1` = 1

sec 90° = `1/x = 1/0`, which is not defined

cot 90° = `x/y = 0/1` = 0