$f\left(x\right)=8x^4-7x^2+5x$
$\int\:\frac{r^2}{r-4}dr$
$\left(2x+1\right)\cdot e^{-x}$
$3\cdot8+\left(-1\right)-[2-1+\left(2-3\right)\cdot4:2]$
$2^2\:+\:2^3$
$\sqrt[3]{x^2+16x\frac{1}{4}-2x+4}$
$sec^2\left(x\right)-cot\left(x\right)$
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