$75\:+\:\left(-12\right)\:+\:2\:$
$\frac{6x^4-41x^2+3x+6}{2x^2-4x\:-3\:}$
$\int\frac{2x}{\left(1-x\right)^2}dx$
$\sqrt{x^2}+2-\sqrt{x}$
$\left(m-7\right)\left(m+2\right)$
$1x^2+26x+169$
$\int sen\:9x\:cos2x\:dx$
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