$x-3\cdot x+1$
$1x^2-81$
$\left(6x-4y^2\right)^3$
$\cot\left(67.5\right)$
$\left(0.2-x\right)^2$
$\int7\left(1+cosx\right)^2dx$
$\frac{d}{dx}1.4t-0.06t^2+50$
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