$-\left(-3\right)+\left(-41\right)-7-\left(-19\right)$
$4\frac{d^2}{dx^2}\left(y\right)+64y=cos\left(5x\right)$
$-7+4^2$
$\frac{2b^4}{b^{-3}\cdot2ab^{-2}}$
$\lim_{x\to-2}\left(\frac{x^2-x+a}{x^2+3x+b}\right)$
$a^2\cdot m^{-2}m^{-5}$
$x^3\cdot\frac{1}{x}^4$
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