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\lim_{x\to 0}((1/\sin^2x)(\sin^2 x/x^2-x^2/x^2)+\sin^2 x/\sin^2 x)
\lim_{x\to 0}((1/\sin^2x)(\sin^2 x/x^2-x^2/x^2)+\sin^2 x/\sin^2 x)
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