$30:\left(15-5\right)-\left[8-\left(2+7-12\right)+6\right]$
$\left(\frac{x^3}{x^4+2}+2y\right)dx+\left(2x+ycos\left(y^2\right)\right)dy=0$
$cot\left(\frac{\pi}{2}-\left(x\right)\right)\cot\left(x\right)=1$
$\frac{dy}{dx}\left(x^{\frac{1}{2}}+y^{\frac{1}{2}}-1\right)$
$\sqrt{\left(0-1\right)}^2+\left(0-2\right)^2$
$\int\left(2x-4\right)^2dx$
$x\left(5x-3\right)=36$
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