$7\left(a+2\right)$
$\left(4x\:-3y\right)^2$
$\int\frac{8x-1}{x^{2\:}+x-6}dx$
$\sqrt{\frac{6x^3}{tan\frac{x}{2}}}$
$\cos^230\sec30$
$8x-4$
$\left(2k+3e\right)\left(2k-3e\right)$
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