1. cos15°
sin 150-2=???
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1
Answer:
Sin(150) = sin (90 + 60) = sin (90 - 60) = sin(30) = ½.
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2
Answer:
cos 300 ° cos 1 2 150 ° 2 cos 2 150 ° sin 2 150 ° . sin 300 ° 2 sin 150 ° cos 150 ° . sin 75 ° sin 15 ° cos 60 ° cos 15 ° sin 60 ° . cos 75 ° cos 150 ° 2 B 1 ...
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