Correct Answer: Option C

Explanation

Using, cos \(\alpha\) = \(\frac{ b^2 + c^2 - a^2}{2bc}\)

cos \(\alpha\) = \(\frac{ 9^2 + 7^2 - (10)^2}{2 \times 9 \times 7}\)

=  \(\frac{ 130 - 100}{126}\) =  \(\frac{30}{126}\) = \(\frac{5}{21}\)

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