$\left(1+tanx\right)\left(1-tanx\right)=\:sec^2x$
$\sqrt{4x^2y^4}$
$-2h\:+\:12\:\le\:122$
$y^4+32y^2+256y=0$
$\frac{dy}{dx}\left(2y^2+1.7xy+x^2=50\right)$
$-3a=15$
$9x^2-24xw+16w^2$
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