参数方程求导,过程,谢谢

如题所述

(1)
dy/dx=t'/(sint)'=1/cost
(2)
dy/dx=(2+t+t²)'/(1-t)'=(2t+1)/(-1)=-2t-1
(3)
dy/dx=(4sinθ)'/(5cosθ)'=4cosθ/(-5sinθ)=-(4/5)cotθ
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