упростить выражения
а) ctg(π-α)-cos(π+α)+sin(3π/2+α)+tg(π/2+α)
б) cos3α+cosα
------------------
2cosα
а) ctg(π-α)-cos(π+α)+sin(3π/2+α)+tg(π/2+α)
б) cos3α+cosα
------------------
2cosα
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