$8-9-1+12-1$
$2\sin x=\sin2x$
$\frac{dy}{dx}=\frac{18}{x}$
$f\left(x\right)=\left(\frac{1+2x^2}{5-7x}\right)^4$
$71^3\cdot71^2$
$\frac{dx}{dt}=4-\frac{x}{500+2t}$
$6a^2\:b+3\:a$
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