$\frac{x^2}{9}-1$
$\tan30\cdot\sin30+\cos30=\sin30$
$\ln\left(x+6\right)+\ln\left(3\right)=2\ln x$
$\lim_{x\to0}\left(\frac{6}{x+2}\right)$
$-5-x+4x-5-4$
$\sec a=-\frac{\sqrt{3}}{3}$
$\int6x^4e^{-3x}dx$
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