$\left(x^2+3x\right)+\left(x^4+6x^2\right)+\left(-x^3-2\right)$
$-2x+3+x-5$
$\left(k^7+6\right)^2$
$\:xy-2x^2-y=3$
$\csc\left(x\right)\tan\left(x\right)+\sec\left(-x\right)$
$\int_o^{\frac{\pi}{4}}\left(secx\right)dx$
$\frac{x}{y^2-1}=\frac{dy}{dx}$
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