fxexsinx的精选

问题详情：若函数f(x)=exsinx,则此函数图象在点(4,f(4))处的切线的倾斜角为()A.         B.0      C.钝角       D.锐角【回答】C.y′|x=4=(exsinx+excosx)|x=4=e4(sin4+cos4)=e4sin<0,故倾斜角...