Question

срочно прошу!!!!!!!!!!!!!!!!!!!!!!!
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Answer 1

Ответ:

Объяснение:

$\frac{sin^{2}\alpha}{cos^{2}\alpha}-sin^{2}\alpha = sin^{2}\alpha*\frac{sin^{2}\alpha}{cos^{2}\alpha};$

$sin^{2}\alpha*(\frac{1}{cos^{2}\alpha}-1)=sin^{2}\alpha*\frac{sin^{2}\alpha}{cos^{2}\alpha};$

$sin^{2}\alpha*(\frac{1}{cos^{2}\alpha}-\frac{cos^{2}\alpha}{cos^{2}\alpha})=sin^{2}\alpha*\frac{sin^{2}\alpha}{cos^{2}\alpha};$

$sin^{2}\alpha*\frac{1-cos^{2}\alpha}{cos^{2}\alpha}=sin^{2}\alpha*\frac{sin^{2}\alpha}{cos^{2}\alpha};$

$sin^{2}\alpha*\frac{sin^{2}\alpha}{cos^{2}\alpha}=sin^{2}\alpha*\frac{sin^{2}\alpha}{cos^{2}\alpha};$

Ч. т. д.