$1290\:por\:5$
$x+4=6$
$\frac{x^4-2x^3+3\:x-6}{x-3}$
$2cos\left(\frac{\pi}{7}x\right)\:=\sqrt{3}$
$\ln\left(x\left(x^2+2\right)\right)$
$25\:.\:\left(-5\right)\:+\:9\:$
$\frac{d^2}{dx^2}\left(3x^3-x^2+6x-4\right)$
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