Вычислите a) Sina, если cos(a+ p/3)=-3/5, P/2< a+P/3<p
b) Cosa, если sin(P/6-a)= 2√2/3, P/2<P/6-a<P
b) Cosa, если sin(P/6-a)= 2√2/3, P/2<P/6-a<P
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