If x + y+ z =xyz, then prove that 2x1-x2+2y1-y2+2z1-z2=2x1-x22y1-y22z1-z2 .

If x + y+ z =xyz, then prove that $\frac{2 x}{1 - x^{2}} + \frac{2 y}{1 - y^{2}} + \frac{2 z}{1 - z^{2}} = \frac{2 x}{1 - x^{2}} \frac{2 y}{1 - y^{2}} \frac{2 z}{1 - z^{2}}$ .

Matching exercise

Match the items on the right to the items on the left.

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