$cotx=-\frac{5}{3}$
$\left(8b\:+\:10\right)$
$\int_1^{\infty\:}\frac{3e^{4x}}{1+e^{8x}}dx$
$5^8\cdot5^3$
$x^2+10x+20=5$
$\left(\frac{3}{8}x^2+\frac{1}{4}x-\frac{2}{5}\right)\left(2x^3-\frac{1}{3}x\right)$
$y=\ln\left(x^{2}-x\right)$
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