x+2−2=x\sqrt{x+2}-2=xx+2−2=x
(9−7c)(5+3c)\left(9-7c\right)\left(5+3c\right)(9−7c)(5+3c)
a3−b3+2\sqrt{a^3}-b^3+2a3−b3+2
20x2y−12x2y2z20x^2y-12x^2y^2z20x2y−12x2y2z
2x2+3x+6=02x^2+3x+6=02x2+3x+6=0
cos2x(1+cot2x)=sin2xcos^2x\left(1+cot^2x\right)=sin^2xcos2x(1+cot2x)=sin2x
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