$\int\frac{1}{\sqrt{36-81x^2}}dx$
$3x^2+3x+6$
$\left(a+3b\right)\:\left(a-2b\right);a=-1,b=2$
$15x=105$
$\left(\frac{2}{b}+1\right)^2$
$\frac{2}{3}a\cdot\frac{3}{4}b$
$\int\frac{80x^3}{cos^2\left(5x^4+1\right)}dx$
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