$\lim_{x\to\infty}\left(1+\frac{9}{x}\right)^{\frac{x}{12}}$
$x-6\sqrt{x^2}+5x-66$
$\left(\frac{3x}{-x-1}\right)-x^2$
$30\cdot37-4\cdot37$
$\int x\left(7x^2+1\right)dx$
$3x^3+5x^6-6x^2-10x^5$
$\csc^2a\tan\left(2a\right)=\frac{2\cos\left(a\right)}{\cos\left(2a\right)\sin a}$
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