If an angle (θ) is divided in two parts such that the Tangent of one part is (m) times the Tangent of the other, then prove that their difference (ϕ) is obtained from the equation
sin ϕ = sin θ [ (m-1)/(m+1) ]
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Update:Michael : Hi. Appreciable approach . Very nice.
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Verified answer
The proof is shown as following: