$4\cdot90$
$x\frac{dy}{dx}+y=2\cdot$
$\left(1+y^2\right)^{\left(\frac{1}{2}\right)}dx=y\left(1+x^2\right)^{\left(\frac{1}{2}\right)}dy$
$\lim_{x\to0}\left(\frac{1+xe^x}{1-\cos\left(x\right)}\right)$
$\int-7x^2e^{-4x}dx$
$-60+2$
$x^3+5x-1:x^2+1x\:$
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