Докажите, что:
1) | tg a+ctg a | >=2;
2) sin^3 x (1+ctg x) + cos^3 x (1+tg x) = sin x + cos x
1) | tg a+ctg a | >=2;
2) sin^3 x (1+ctg x) + cos^3 x (1+tg x) = sin x + cos x
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