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Remember that: $csc^2x=cot^2x+1$ $csc^2x-1=cot^2x$ $(2~csc~x+2)(2~csc~x-2)=(2~csc~x)^2-2^2=4~csc^2x-4=4(csc^2x-1)=4~cot^2x$
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