$3a^2.4a^2$
$\frac{x+3}{x^2-7x+12}$
$\left(2a^2-a^3\right)^4$
$2-\frac{6}{-3}$
$100+140x-49x^2$
$x^4-5x^3+6x^2$
$2cos^2x-1=\frac{\left(1-tan^2x\right)}{1+tan^2x}$
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