$\int_4^{\infty}\left(\frac{1}{4+x^2}\right)dx$
$x^2x^{\frac{2}{5}}$
$2x^4-7x^3-2x^2+13x-6$
$\int-4dx$
$\lim_{x\to\infty}\left(\frac{lnx+x}{x-1}\right)$
$\cos\left(2a\right)-3\sin a+1=0$
$\int5\sec\left(2x-3\right)\tan\left(2x-3\right)dx$
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