$\int\:\frac{2x+1}{2x^2-x+6}dx$
$3b+b+2b$
$ab^2=128$
$\left(-4\right)-\left(-18\right)$
$2ab+4a$
$\frac{cosx+2cosxsinx}{cos^2\left(x\right)-sin^2\left(x\right)-sinx}$
$\left(1-7x\right)\:\left(3x\:-1\right)$
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