SOLUTION: Prove {{{(tan(A+B)-tan(A))/(1+tan(A+B)tan A)}}}{{{""=""}}}{{{tan(B)}}}

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Question 1058324: Prove
Answer by Edwin McCravy(20060)   (Show Source): You can put this solution on YOUR website!



We work with the left side

The formula for  is



If we substitute  and 
in that formula



the right side is the the same as the left side of
the identity we are to prove, so the left side is



which becomes





Edwin
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