$\frac{tan\left(a\right)}{1+sec\left(a\right)}+\frac{1+sec\left(a\right)}{tan\left(a\right)}=2csc\left(a\right)$
$\left(3y^2+2x\right)\:\left(3y^2-2x\right)$
$\left(x+7\right)\left(x+1\right)$
$\left(x-8\:\right)\left(x+\:5\right)$
$cos^2x\cdot\:\:cscx\cdot\:\:secx\:=\:cotx$
$128x^2-54y^{12}$
$\left(z+0.63\right)\left(z-\sqrt{y}\right)$
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