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Автор - TETRIS24

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Проверено экспертом

Автор - oganesbagoyan
1) 3cos2α +sin²α -cos²α =3cos2α - (cos²α -sin²α) =3cos2α -cos2α =2cos2α .
2) (sin5α - sin3α)/2cos4α = (2sin(5α -3α)/2*cos(5α + 3α)/2)/2cos4α =
2sinα*cos4α/2cos4α =sinα.

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