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= 4(csc^2 x - cot^2 x) (csc^2 x + cot^2 x) / (csc^2 x - cot^2 x)
> (csc^2 x - cot^2 x) dicoret
= 4(csc^2 x + cot^2 x)
> karena csc^2 x = 1 + cot^2 x
=4{ (1 + cot^2 x) + cot^2 x}
=4( 1 + 2cot^2 x)
=4 + 8cot^2 x
nb: ( ^ ) pangkat, ( / ) bagi