Correct Answer: Option D

Explanation

cos\(\theta\) = \(\frac{13^2 + 9^2 - 11^2}{2(13)(9)}\)

= \(\frac{169 + 81 - 21}{26 \times 9}\)

cos\(\theta\) = \(\frac{129}{26 \times 9}\)

= \(\frac{43}{78}\)

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