sinα если cosα=-3/5 π<α<3π/2 №1
sin(90°-α)-cos(180°-α)+tg(180°+α)-cos(270°-α) №2
сtg13°×ctg17°×ctg21°......ctg77° №3
sin(90°-α)-cos(180°-α)+tg(180°+α)-cos(270°-α) №2
сtg13°×ctg17°×ctg21°......ctg77° №3
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