$2\pi\int_0^3x\left[-\frac{1}{2}x^3+x^2+x+3\right]dx$
$-\frac{5}{8}+\frac{5}{8}$
$512b^{18}-1$
$\int\left(\frac{x-x^2}{x^3+x^2+x+1}\right)dx$
$\left(2a^4+3b^3c\right)^3$
$2\cos\left(2x\right)-1=cos\left(4x\right)+cos\left(2x\right)$
$k=\:cos10+cos110+cos130$
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