Correct Answer: Option D

Explanation

Sin(-690^o) = Sin(-360 -3300

sin - 360 = sin 0

∴ sin(-690^o) = sin(330^o)

Negative angles are measured in clockwise direction

The acute angle equivalent of sin(-330^o) = sin(30^o)

sin(-330^o) = sin(30^o)

= \(\frac{1}{2}\)

= 0.5

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