Упростите выражение:
cos^2 t+1- sin^2 t
(1-cos t)*(1+cos t)
sin^2 t + 2cos^2 t-1
cos^2 t+1- sin^2 t
(1-cos t)*(1+cos t)
sin^2 t + 2cos^2 t-1
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Answers & Comments
2)=1-cos^2t=sin^2t
3)=1+cos^2t-1=cos^2t