40 3 примера : sin2α+sin8α/cos2α-cos8α довести тождество: (ctg(π/2-α)*(sin(3π/2 -α)+sin(π+α)) / (ctg(π+α)*(cos(2π+α)-sin(2π-α) ) = -tg^2 α 16cos π/9 cos 2π/9 cos 4π/9=2
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