$\frac{dy}{dx}+\frac{2y}{x}=\frac{4\cos\left(x\right)}{x^2}$
$-4z\:+\:9z^2\:+\:2z\:+\:3$
$\frac{3x}{x-2}=\frac{6}{x-2}+1$
$f\left(x\right)=\:in\:\left(\frac{6x}{5}\right)$
$\lim_{x\to1}\left(\frac{x}{\ln\left(x\right)}-\frac{1}{xlnx}\right)$
$7,09\cdot18,32$
$x2\:+\:3x\:+\:c\:=\:\frac{7}{4}+c$
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