$\frac{1}{tan\:\left(\theta\right)}$
$f\left(x\right)=\:\left(4x^3+3x^2-2x^4\right)^3$
$\int\frac{x^4-9}{9+x^2}dx$
$\frac{4ax^2-ax+15-20x}{2xa-5};\:a=1$
$\frac{dy}{dx}=5x^2y^2$
$\left(7-2+4\right)-\left(2-6\right)$
$6x+x^2=31$
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