$h^2+2hj+j^2$
$2.\left(a+3\right)\:\left(a-3\right)$
$\left(4y-1\right)^5$
$cosx-cos^2x=\frac{cscx-cotx}{cotx+tanx}$
$3-2\cos^2x=2\sin2x+1$
$1=\tan\left(x\right)$
$2y^3-8x^2y$
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