$\int\left(\frac{2e^{2x}}{4+e^{2x}}\right)dx$
$7x+13=3x+5$
$\sqrt{5}.\sqrt{4}$
$9x^2+24x+1$
$\left(sec23\:+\:cos23\right)\:\left(sec23\:-\:cos23\right)\:$
$\frac{\left(-2x\cdot2x^{2}y^{4}\right)^{3}}{\left(3y\right)^{2}}$
$tan^2x-8tanx+13=0$
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