$\int\frac{\sqrt{4x^2+49}}{x^3}dx$
$\left(\frac{5}{6}a+\frac{3}{7}b\right)\left(\frac{5}{6}a-\frac{4}{7}b\right)$
$\int\:\frac{1}{x^2+1}dx$
$2\log\left(y+5\right)=\log\left(20\right)-\log\left(5\right)$
$4x^2+8xy$
$-9-10+1$
$2\int_{-4}^0x^2\sqrt{4+x}dx$
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