$6x+1+7x$
$\frac{2x}{\sqrt{x}}\frac{\sqrt{x}}{\sqrt{x}}$
$3n^2+18n-48$
$\lim_{x\to\infty}\left(\left(\frac{1}{e^{6x}-1}\right)^{\frac{7}{x}}\right)$
$\sin\left(x\right)\cos\left(x\right)+\sin\left(x\right)^3\sec\left(x\right)=\tan\left(x\right)$
$\int x\cdot\cos\left(x\right)wdx$
$x^2-x-y^2+y^2$
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