Correct Answer: Option A

Explanation

xz² = xy² + yx² - 2(xy) (yz) cos 120^o

= 2² + 1² - 2(2) (1) cos 120²

= 4 + 1 - 4x - cos 60 = 5 - 4x - \(\frac{1}{2}\)

5 + 2 = 7

xz = \(\sqrt{7}\)m

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