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1-(cot^4x+csc^4x)=2csc^2x
ojo: cot^4x+csc^4x=1+2csc^2x.cot^2x
1-(1+2csc^2x.cot^2x)=2csc^2x
1-1-2csc^2x.cot^2x=2csc^2x
cot^2x=2csc^2x/-2csc^2x
cot^2x=-1