$\int7xe^{3x}dx$
$\left(\frac{1}{a}-b\right)\left(b+\frac{1}{a}\right)$
$sec^2x-1$
$2a^2\left(2a+3b-2c\right)$
$\:2x+3\left(x-4\right)=18$
$\int\left(\frac{\left(x^2+4x+1\right)}{\left(x-1\right)\left(x+1\right)\left(x+3\right)}\right)dx$
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