$y'+\tan\left(x\right)y=2x\cos\left(x\right)$
$\left(2+m^2\right)^2$
$\frac{dy}{dx}=\frac{2}{2x+y+1}$
$\left(x^5y^3\right)^4$
$\left(2x+3y\right)\left(2x-3y\right)-3\left(x+2y\right)\left(x-2y\right)$
$-15.23-15.79$
$-3+\left(-5\cdot2+10-3\right)$
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