$x^4\left(2a-\:5b\right)+x\left(2a-5b\right)-5\left(2a-5b\right)$
$ex^{-x}$
$\lim_{x\to-5}\left(\frac{\sqrt{21+3x}-4x+2}{\sqrt[3]{3}x\:-6x+8}\right)$
$\frac{15x^{5}y^{6}}{25x^{6}y^{3}}$
$\lim_{x\to4}\left(\frac{3-\sqrt[3]{3x+3}}{\sqrt[3]{x}-2}\right)$
$\left(x-2\right)^2-\left(x^2-4x-4\right)^2-4x\left(x-4\right)-12x^2$
$\frac{\cos\left(2x\right)+\cos\left(2y\right)}{\sin\left(x\right)+\cos\left(y\right)}=2\cos\left(y\right)-2\sin\left(x\right)$
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