Доказать тождества:
1) 1 - tg^2 x = (cos2x) / (cos^2 x)
2) ctg^2 x - 1 = (cos2x) / (sin^2 x)
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Доказать тождества:
1) 1 - tg^2 x = (cos2x) / (cos^2 x)
2) ctg^2 x - 1 = (cos2x) / (sin^2 x)
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1) 3 sin x + 2 cos x + 2;
2) 5 cos x – sin x + 5.
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