Question

The value of sin (-420°)

विकल्प

• `sqrt3/2`

• `- sqrt3/2`

• `1/2`

• `- 1/2`

Answer 1

`- sqrt3/2`

Explanation:

sin(-420°) = -sin(420°) [∵ sin(-θ) = -sin θ]

= -sin(360° + 60°)

= -sin 60°

= `- sqrt3/2`