10. Cos a + cos b + 2cos c=2 then the sides of triangle are in ap,gp,HP?

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a {c o s}^{2} (C / 2) + c {c o s}^{2} (A / 2) = \frac{3 b}{2}

cos A + cos C = 4 {sin}^{2} \frac{1}{2} B

a, b, c

G . P .

△ A B C,

cos A + 2 cos B + cos C = 2,

△ A B C

a, b, c

x^{3} - 11 x^{2} + 38 x - 40 = 0

\frac{cos A}{a} + \frac{cos B}{b} + \frac{cos C}{c} =

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a {cos}^{2} \frac{C}{2} + c {cos}^{2} \frac{A}{2} = \frac{3 b}{2}

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