Question

The values of sin 690° is ? *​

Answer 1

Answer:

sin 690°

= sin(7×90°+60°)

= -cos 60°

= -1/2

Answer 2

The value of sin(690°)

sin(690°)= sin(180×4 -30°)

sin(4π-30°)

It's in 4th quadrant so the value of sin will be -ve

Sin690°= -1/2