$\:6\left(7x+2\right)+7$
$4x+7xy-3x\:+1xy\:-\:5$
$\tan\left(\frac{1}{2}\pi+x\right)=-\cot\left(x\right)$
$\frac{d^2}{dx^2}\left(\frac{3}{8x^4}\right)$
$n^2-18n+81$
$\int\left(\frac{x}{\left(x^2+1\right)^{\frac{21}{2}}}\right)dx$
$10b-4b-b+2+6$
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