$dr=\left(r\right)ds$
$\cos\left(d\right)\left(\tan\left(d\right)+\cot\left(d\right)\right)=\csc\left(d\right)$
$2x^2-5x+7=\:0$
$5-\:2\left(\:3x-4\right)\:-2x\:<\:-6x\:+\:4$
$\left(5+m+n\right)\left(5-m-n\right)$
$8y\cdot6x^4y^2$
$\frac{1}{16}\int xe^{\frac{-x}{4}}dx$
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