$9\left(2b+2\right)+8$
$\left(1+e^x\right)cos\left(y\right)y'=e^xsin\left(y\right)$
$\lim_{x\to0}\left(5x+4\right)$
$7x+49=14$
$-3.21^{\pi}$
$\frac{4x}{3}<\frac{5}{2}$
$x\frac{dy}{dx}-4y=3x^4e^x$
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