Ответ №1
= cos^2x + sin^2x - 2cos^2x / cosx+sinx = sin^2x-cos^2x / cosx +sinx = (sinx-cosx)(sinx+cosx)/ cosx+sinx = sinx-cosx
Ответ №1
= cos^2x + sin^2x - 2cos^2x / cosx+sinx = sin^2x-cos^2x / cosx +sinx = (sinx-cosx)(sinx+cosx)/ cosx+sinx = sinx-cosx
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