What is the value of sin π and cos π?

Solution:

In a right angle triangle, sin(θ) is the ratio of the opposite(perpendicular) side to the hypotenuse, while cos(θ) is the ratio of the base(adjacent) side to the hypotenuse.

π = 180º and π/2 = 90º

Using trigonometric identity, sin θ = cos (90º - θ) and cos θ = sin (90º - θ)

sin (π) = cos (π /2 - π)  = cos (-π /2) = 0 

∴ sin (π) = -0 or 0

cos (π) = sin (π /2 - π) = sin (-π /2) = -1

∴ cos(π) = -1

Thus, the value of sin π is 0 and cos π is -1.

What is the value of sin π and cos π?

Summary:

The value of sin π is 0 and cos π is -1.