Question

Find the trigonometric functions of :

180°

Answer 1

Angle of measure 180°:

Let m∠XOA = 180°

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

∴ x = – 1 and y = 0

sin 180° = y = 0

cos 180° = x = – 1

tan 180° = `y/x`

= `0/(-1)`

= 0

cosec 180° = `1/y`

= `1/0`,

which is not defined.

sec 180° = `1/x = 1/(-1)` = – 1

cot 180° = `x/y = (-1)/0`, which is not defined.