$2mn+9m^2+\frac{n^2}{2}$
$-6x\cdot2x^3$
$y-17=97$
$\frac{\tan x}{\sec x-1}-\frac{\tan x}{1+\sec x}=2\sin x$
$5t<-10$
$\int\left(\frac{x+2}{2x^2+8x+2}\right)dx$
$\int_x^0\left(2\cdot t\right)dx$
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