$\lim_{x\to0}\left(\frac{7^x-3^x}{2x}\right)$
$\left(k+\frac{1}{n}\right)^n$
$\int\left(3^x\cdot4x\right)dx$
$9-\left(-64\right)$
$\cos\left(x\right)\cdot\sec\left(x\right)=\cos\left(x\right)$
$199-\left(-900\right)$
$8x^3y^2+4x^5$
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