$\ln\cot x$
$xdy\:=\:ylnydx\:,\:y\left(\frac{1}{2}\right)=e$
$90m^2n\cdot30n^2m$
$\int_1^{\infty}\left(\frac{1}{\sqrt{u}}\right)du$
$196m^2n^4-121m^8n^6$
$\sqrt{6x^2-3x^2y^3}$
$\frac{sin^2}{\cos^2}+sec\:cos$
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