$( 5 a ^ { 2 } - 7 b ^ { 2 } ) ^ { 2 }$
$\left(a-b^2\right)\left(a+b\right)$
$13mn+8b+9mn-3b$
$\int\frac{5x+2}{-2x^2+3x+4}dx$
$\frac{dy}{dx}=\frac{x^1+xy}{1+x^2}$
$\frac{sen2x-2cos^2x}{sen2x-2sen^2x}$
$\int\frac{6x^2+1}{x^2+4x+3}dx$
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