$5\tan\left(x\right)+9=20$
$\frac{tan\left(x\right)}{-cot\left(x\right)}$
$-16+m^4$
$4\left(x+2\right)-3\left(x-5\right)<x$
$\left(6x\right)^2-2\left(6x\right)\left(y^2\right)+\left(y^2\right)^2$
$\frac{d^2}{dx^2}5x^2$
$x^2+12x-7\:=0$
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