If Cos(Ɵ-α), Cos Ɵ, Cos (Ɵ+α)are in H.P., then prove that Cos2Ɵ = 1+Cosα
Sanjay Kumar , 8 Years ago
Grade 11
Trigonometry> If Cos (Ɵ-α), Cos Ɵ, Cos (Ɵ+α) are in H.P...
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Last Activity: 8 Years ago
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