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Sin 60° has the same value as I. Sin 120° II. cos 240° III. -sin 150°...

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
  • E. IV and V only
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Correct Answer: Option A
Explanation

In the second quadrant, \(\sin 120 = \sin (180 - 120)\)

= \(\sin 60\)

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