lim(x趋近于0)((1/sin^2 x)-(cos^2 x)/x^2)=
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lim(x趋近于0)((1/sin^2x)-(cos^2x)/x^2)=lim(x趋近于0)((1/sin^2x)-(cos^2x)/x^2)=lim(x趋近于0)((1/sin^2x)-(cos^2
lim(x趋近于0)((1/sin^2 x)-(cos^2 x)/x^2)=
lim(x趋近于0)((1/sin^2 x)-(cos^2 x)/x^2)=
lim(x趋近于0)((1/sin^2 x)-(cos^2 x)/x^2)=
lim(x→0)((1/sin^2 x)-(cos^2 x)/x^2)
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