$4x^4-4b^4$
$\frac{\sin^2x-\cos^2x}{1-\cot^2x}$
$3\left(2x^2+x\right)$
$4-4x+4^2$
$\int-4xe^{8x}dx$
$\left(2k+1\right)\left(4k-3\right)$
$5sin\left(3x\right)-1=3\:$
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