доказать тождество:
(sin^2t+cos^2t/tg^2t*cos^2t)-(cos^2t/1-cos^2t)=1
(sin^2t+cos^2t/tg^2t*cos^2t)-(cos^2t/1-cos^2t)=1
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Answers & Comments
(1/sin^2t) - (cos^2t/sin^2t)=1
(1-cos^2t)/sin^2t=1
sin^2t/sin^2t=1
1=1
ч.т.д.