$\left(5x^4\:-y^4\right)^2$
$-\left(x-4\right)^2$
$\int\left(2x-1\right)^4x^2dx$
$4x-3=3x+2$
$-\sin^2\left(x\right)\sin^2\left(x\right)$
$x+6=8+3x$
$\cos^2\left(x\right)-\sin^2\left(x\right)=\cos2\left(x\right)$
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