x3−x+1x+1\frac{x^3-x+1}{x+1}x+1x3−x+1
(cot+1)(3cotx+1)=0\left(\cot+1\right)\left(\sqrt{3}\cot x+1\right)=0(cot+1)(3cotx+1)=0
x2+72x+xx^2+72x+xx2+72x+x
2x+2zy=cz2x+2zy=cz2x+2zy=cz
7x2−14x−3x−1\frac{7x^2-14x-3}{x-1}x−17x2−14x−3
4x+8y4x+8y4x+8y
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