{x=∫0tsinudu,
{y=sint
则dy/dx=_____.

{x=∫0tsinudu,
{y=sint
则dy/dx=_____.
【正确答案】:cott 分析:利用参数方程求导公式有 dy/dx=(dy/dt)/(dx/dt)=(sint)′/(∫0tsinudu)=cost/sint=cott
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