What is the value of sin(-690)?
-
A.
(frac{sqrt{3}}{2}) -
B.
-(frac{sqrt{3}}{2}) -
C.
(frac{-1}{2}) -
D.
(frac{1}{2})
Correct Answer: Option D
Explanation
Sin(-690o) = Sin(-360 -3300
sin – 360 = sin 0
∴ sin(-690o) = sin(330o)
Negative angles are measured in clockwise direction
The acute angle equivalent of sin(-330o) = sin(30o)
sin(-330o) = sin(30o)
= (frac{1}{2})
= 0.5