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AM NEVOIE URGENT DAU COROANA Sa se aduca la forma cea mai simpla expresia: 1)Cos^2( α)-cos^4(α)+sin^4(α)+tg(α)*cos(α)
2)Sin(α)-sin^3(α)-cos(α)+cos^3(α)
3)(tg(α)+ctg(α))(1-sin(α))(1+sin(α))