(z−1)⋅(z+1)2\left(z-1\right)\cdot\left(z+1\right)^2(z−1)⋅(z+1)2
(cot(x)+tan(y))(sin(x+y)+sin(x−y))\:\left(\cot\left(x\right)+\tan\left(y\right)\right)\left(\sin\left(x+y\right)+\sin\left(x-y\right)\right)(cot(x)+tan(y))(sin(x+y)+sin(x−y))
(x2+y7)(x2−y7)\left(\frac{x}{2}+\frac{y}{7}\right)\left(\frac{x}{2}-\frac{y}{7}\right)(2x+7y)(2x−7y)
x−1x2+3x+2\frac{x-1}{x^2+3x+2}x2+3x+2x−1
7times 477times\:\frac{4}{7}7times74
2(z+3)+3(5−3z)2\left(z+3\right)+3\left(5-3z\right)2(z+3)+3(5−3z)
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