$x^2-18x+19$
$3x^{\frac{3}{2}}-9x^{\frac{1}{2}}+6x^{-\frac{1}{2}}$
$\sqrt[4]{x^{16}}$
$\left(\tan\left(x\right)\:+\:\cot\left(x\right)\right)\cdot cos^2x$
$\tan^2+1=2$
$64a^8+\:142a^4b^5.81b^{10}$
$\frac{dy}{dx}=5-2\left(x+y\right)$
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