$\ln\left(xy\right)+y^2,x=e^t,y=e^{-t}$
$3\left(x-2\right)+5$
$32-15-7-0.14-14\cdot\left(-0.7\right)$
$\frac{3x^5-20x^3}{32}$
$\left(-6\right)^2\cdot\left(-6\right)^{-9}\cdot\left(-6\right)^3$
$\frac{dy}{dt}=yt+4t$
$81x^2+4-36x^2$
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