$12b-5<8b+7$
$\int3x^2\left(3x^3+5\right)^7dx$
$16x^2+160x+391$
$x^2+1+x^2+9$
$\sin^4x-\cos^4x=1-2\cos^2$
$\int_{2\:}^{\infty}\left(\frac{2}{x^2}\right)dx$
$\frac{\left(x^3+2x^2\right)}{3x^2-1}$
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