Question

пожалуйста, упростить выражение!

ctg^2t(1-cos^2t)

Answer 1

(1-cos^2t)=sin^2t

ctg^2t=cos^2t/sin^2t

cos^2t/sin^2t*sin^2t=cos^2t

Answer 2

ctg^2t(1-cos^2t)
(1-cos^2t)=sin^2t

ctg^2t=cos^2t/sin^2t

cos^2t/sin^2t*sin^2t=cos^2t