设{x=∫0tsinudu，{y=sint则dy/dx=_____.

设
{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