设函数y=y（x）由参数方程
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Night________(fall),wehurriedhome.
WhenIcamethroughthecustomsattheairport,Ihadtopay________onaclockIhadbought.
设函数f(x)=1-x^2在区间(,)
设f(x,y)在点(0,0)附近有定义,且,则
设函数y=sinx^2+2x，求dy.
