$\frac{18x^7-56x}{4x}$
$\int v\cdot e^{\frac{v}{2}}dx$
$x^2-4x-1$
$a+1\:\cdot\:a+2$
$\frac{\sin2a}{1-\cos2a}=\cot a$
$5+4+78$
$\int\left(\frac{\sqrt{1+lnx}}{x}\right)dx$
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