设y=y(x)由(cosy)x=(sinx)y确定,求dy.
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设a≥0,证明:当x>0时,(1-2ax+x2)e-x<1.
求曲线x2+3xy+y2+1=0在点M0(2,-1)处的切线方程与法线方程.
若有定义语句:int a=3,b=2;,则表达式a<ba:b的值是______。
Did the girl see the film during school hours
A. Yes,but she came too early.
B. Yes, but she came too late to meet any people.
C. No, she lost her way so she want back home.