Properties of TriangleHard

Question

If in a triangle ABC a cos + c cos2 = , then the sides a, b and c

Options

A.are in A.P.
B.are in G.P.
C.are in H.P.
D.satisfy a + b = c

Solution


⇒ a + c + b = 3b
a + c = 2b.
Hence, (A) is the correct answer

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