$2x^2y+2x^2z+2x^22v$
$\frac{d}{dx}\left(3^x\right)-4^x$
$5\cos^2x=3+3\sin\left(x\right)$
$f\left(x\right)=\frac{3x^2}{2}+5$
$\frac{x-4}{x^2-3x-4};\:x=3.99;\:$
$\left(-4a^3+2a^2-8a+12\right)+\left(2a^3+2a-1\right)$
$x^2+16x+61=0$
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