-sinx*(1+sinx)-cx*cosx/ (1+sinx)^2又是等于多少啊?怎样化简的,麻烦写得详细点,谢谢
[-sinx*(1+sinx)-cosx*cosx]/ (1+sinx)^2= [-sinx-(sinx)^2-(cosx)^2]/ (1+sinx)^2= [-sinx-1]/ (1+sinx)^2= -(1+sinx)/(1+sinx)^2= -1/(1+sinx)