Срочно помогите пожалуйста!!!! sin^2a+ 1/sin^2a, если sina- 1/sina=-3. Created by JuliaKaraulova. algebra-ru

sina=-3...

JuliaKaraulova @JuliaKaraulova

August 2022 1 11 Report

Срочно помогите пожалуйста!!!!
sin^2a+ 1/sin^2a, если sina- 1/sina=-3

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$sina- \frac{1}{sina}=-3\\\\(sina-\frac{1}{sina})^2=sin^2a -2\cdot sina\cdot \frac{1}{sina}+ \frac{1}{sin^2} =\\\\=sin^2a-2+ \frac{1}{sin^2a} \\\\\\sin^2a+ \frac{1}{sin^2a}=(sina-\frac{1}{sina} )^2+2=(-3)^2+2=9+2=11$

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