$\:\frac{dy}{dx}+\frac{9}{40}y=-\frac{81}{32}$
$\lim_{x\to0}\left(\frac{e^x-\cos\left(x\right)-x}{x}\right)$
$x^5+10x^4-15x^3$
$\frac{dy}{dx}=\frac{1+x^2}{x}$
$cos\left(x-70\right)=0,5$
$\lim_{x\to2}\left(5-x^2\right)^{\frac{3}{x-2}}$
$-3-12x=3x^2$
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