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Simplify:[(cscx-cotx)(cscx+cotx)]/cscx

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[(cscx-cotx)(cscx+cotx)]/cscx

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= (csc^2 x - cot^2 x)/csc x

= (1 + cot^2 x - cot^2 x)/csc x
= 1/csc x
= sin x
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