$-3b^2\:+\:3x^3\:+\:15\:+\:7b^2\:-\:11x^3\:-\:8$
$\left(a^x+b^x\right)^2$
$x^4-x^3-6x^2$
$\frac{1}{2}k-6$
$\lim_{x\to0}\left(\frac{3^x-1}{2x-1}\right)$
$\int\cot^2\left(x\right)\sec^4\left(x\right)dx$
$\frac{10^{4}\cdot10^{6}}{10^{3}}$
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