Ответ:
1-cos^2x=sin^2x
Ctg^2x=cos^2x÷sin^2x
sin^2x*cos^2x÷sin^2x= cos^2x
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Ответ:
1-cos^2x=sin^2x
Ctg^2x=cos^2x÷sin^2x
sin^2x*cos^2x÷sin^2x= cos^2x