Question

State the value of sin 690°

Answer 1

Step-by-step explanation:

Sin690

Sin690 = Sin 330

{by subtracting 360°}

sin(360-30)

-sin30

-1/2

Answer 2

Step-by-step explanation:

-0.5

sin 690°=sin(720° - 30°)

=sin(4π - π/6)

But , sin (4π - 0) = -sin0.

therefore, sin690° ° -30° = -1/2.