Тригонометрия. Прошу 28,29,30 примеры. Буду благодарна. Created by Alya3802. matematika-ru

Тригонометрия. Прошу 28,29,30 примеры. Буду благодарна...

July 2022 1 3 Report

Тригонометрия. Прошу 28,29,30 примеры. Буду благодарна

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julyap $28)sin ^{2} x+cos ^{2} x+tg ^{2} x=1+tg ^{2} x= \frac{1}{cos ^{2} x} \\ \\ 29) sec ^{2} a-tg ^{2} a-sin ^{2} x= \frac{1}{cos^{2} x} - \frac{sin^{2} x}{cos ^{2} x} -sin^{2} x= \frac{1-sin ^{2} x}{cos ^{2} x} -sin^{2} x= \\ = \frac{cos ^{2} x}{cos^{2} x} -sin ^{2} x=1-sin^{2} x=cos ^{2} x \\ 30) \\ 1) \frac{sin \alpha *sin \beta }{cos \alpha *cos \beta } =tg \alpha *tg \beta \\ 2) \frac{cos \alpha *cos \beta }{sin \alpha *sin \beta } =ctg \alpha *ctg \beta$

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