lim(1/x²-1/sin²x) x→0
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=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
=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
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