=lim (-x²+sin²x)/(x²·sin²x)=lim (-x²+sin²x)/(x^4)=lim (-2x+2sinx·cosx)/(4x³)=lim (-2x+sin2x)/(4x³)=lim (-2+2cos2x)/(12x²)=lim -(1-cos2x)/(6x²)=lim -(1/2)·(2x)²/(6x²)= -1/3
