are the roots of the Q.22 If tan and tan Q.28 equation 8x2 – 26x + 15 = 0 then cos (a + B) is equal to - n 78° (A) - 627 (B) 923 (D)-1

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Pun ob noots: ( tan frac{alpha}{2}+tan frac{B}{2}=frac{2 b}{8} )

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