cos 60° cos 30°- sin 60° sin 30°
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1
Answer:
=1/2 × root3/2 - root 3/2 × 1/2
=root3/4- root3/4
=0
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=cos 60° cos 30°- sin 60° sin 30°
=cos(90°-30°) cos(90°-60°)-sin 60° sin 30°
=sin30° sin60°-sin 60° sin 30°
=0
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