$3x+-2\cdot6$
$\left(-5x^2+10x-1\right)-\left(6x^2-x+3\right)$
$\sqrt{\frac{c^{-1}}{c^3}}$
$\sqrt{1.6}$
$1-81x^2$
$\frac{4x+12}{x-3}$
$c=sen^2x\cdot cotx+cos^2x\cdot tanx$
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