例11y= EInsin x,求 Wrr dr(Insinxy'=I (sin x) cOsx=cotx SInx sIn x结束 解 解 (sin ) sin1 =(ln sin )  =  x  x x dx dy x x x cos cot sin1 解 =  =  (sin ) sin1 =(ln sin )  =  x  x x dx dy x x x cos cot sin1 解 =  =  (sin ) sin1 =(ln sin )=  x  x x dx dy x x x cos cot sin1 =  =  例 11 y =lnsin x 求dx dy 