What is the value of sin(-690)?
- \(\frac{\sqrt{3}}{2}\)
- -\(\frac{\sqrt{3}}{2}\)
- \(\frac{-1}{2}\)
-
\(\frac{1}{2}\)
The correct answer is: D
Explanation
Sin(-690o) = Sin(-360 -3300sin - 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