$xdx+y^3dy=0$
$\frac{\sin\left(2x\right)+\cos\left(2x\right)+1}{\sin\left(x\right)+\cos\left(x\right)}=\frac{2}{\sec\left(x\right)}$
$10x^3+\:76x^2\:+\:162x\:+\:72\:$
$25x-100^4$
$10y>-30$
$\frac{d^2}{dx^2}\left(-\frac{9x^2}{400}+18\right)$
$\left(2r+4t\right)^2$
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