Упростите выражения:
а) sin(a+60)+sin(a-60)
б)cos(30+a)-cos(30-a)
а)sina+sqrt3/2+sina-sqrt3/2=2sina
b)sqrt3/2+cosa-sqrt3/2+cosa=2cosa
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Answers & Comments
а)sina+sqrt3/2+sina-sqrt3/2=2sina
b)sqrt3/2+cosa-sqrt3/2+cosa=2cosa