$\int\frac{4x^2-1}{\left(2x\right)\left(x^2+2x+1\right)}dx$
$\int\left(x^6-49\right)^7x^5\:dx$
$\left(7x-1\right)\left(7x+1\right)$
$\frac{2x+5}{-4x+8}$
$\frac{1}{\cos x}$
$\int\:\left(-x\:sinxn\right)\:dx$
$\int_0^{\frac{\sqrt{2}}{2}}\left(\frac{-10x^2}{\sqrt{1-x^2}}\right)dx$
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