September 2021 0 20 Report
1) (5sin^2α+9sinαcosα+8cos^2α)/(2sin^2α+5sinαcosα+7cos^2α) - ?, якщо tgα=3; 2) (cos5α+cos6α+cos7α)/(sin5α+sin6α+sin7α);
3) (sinα+sin9α)/(cosα+cos9α)=tg5α.
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