$\int\left(x+e\cdot\right)^2$
$\frac{1}{\tan\left(3x\right)}\cdot\frac{1}{\cos\left(3x\right)}$
$8x-\left(1\frac{1}{2}y+6z-2\frac{3}{4}x\right)-\left(-3\frac{3}{5}x+20y\right)-\left(x+\frac{4}{3}y+z\right)$
$f^2-\:2f-15$
$3x^2+3x-x^2+5+5x$
$\frac{3x+1}{x^2+1}=\frac{1}{x+1}$
$4x^2-y^4$
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