Sin 60° has the same value as I. Sin 120° II. cos 240° III. -sin 150° IV. cos 210° V. sin 240°

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

waec 1992 mathematics

The correct answer is A. I only

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

= \(\sin 60\)

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