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I have posted a link there to this thread so the OP may view my work.If an angle α be divided into two parts such that the tangent of one ...........................?

If an angle α be divided into two parts such that the tangent of one part is m times the tangent of the other then prove that their difference β is obtained from the equation :

sin β = [ ( m - 1 ) / ( m + 1 ) ] sin α.