$2cos^4x-cos^2x=0$
$5b^4-10b^3-15b^2+10b$
$\int_0^{\infty}\left(\frac{e^x}{e^2x+3}\right)dx$
$-1\left(-x+7\right)$
$\frac{1}{x^3-2x+1}$
$4x^2-12x+91$
$3k\:+\:k\:=\:20$
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