$\lim_{x\to\infty}\left(\frac{3x+1}{3x-1}\right)^{x^2}$
$4^c=64$
$\int\frac{2}{\sqrt{x^2+16}}dx$
$\int_0^{\frac{\pi}{2}}\left(\frac{5sinx}{1+cos^2x}\right)dx$
$x^4-10x^4\:+25$
$-17+-4+2-8$
$x^2+8x+18=0$
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