$-2x\ge x-8$
$-4-12-\left[\left(-13-20+8\right)-4\right]$
$15\cos^2\left(x\right)+2\sin^2\left(x\right)=7$
$\left(9m^9+5n\right)^2$
$3\left(5\right)^n+30=1905$
$\left(x^2+1\right)+\left(4xy-x\right)y'=0$
$\frac{dy}{dx}=lnt+4t$
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