$14u^2+23u-15$
$\sqrt{81\sin\:^2\left(t\right)+16cos^2\left(t\right)+1296}=0$
$f\left(4\right)=3^4$
$20-3,35$
$\frac{d^4}{dx^4}\left(x^4-2x^3-5x+2\right)$
$5x^2-3x+x^2+4x$
$y-817=13$
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