Sin 60° has the same value as I. Sin 120° II. cos 240° III. -sin
MATHEMATICS
WAEC 1992
Sin 60° has the same value as
I. Sin 120°
II. cos 240°
III. -sin 150°
IV. cos 210°
V. sin 240°
- A. I only
- B. II only
- C. IV only
- D. III only
Correct Answer: A. I only
Explanation
In the second quadrant, sin120=sin(180?120)
= sin60
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