# SOLUTION: Can you please help me to prove a tangent subtraction identity tan(a-b)=(tana-tanb)/(1+tana*tanb) using geometric techniques? Thank you so much!

Algebra ->  Algebra  -> Trigonometry-basics -> SOLUTION: Can you please help me to prove a tangent subtraction identity tan(a-b)=(tana-tanb)/(1+tana*tanb) using geometric techniques? Thank you so much!      Log On

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 Question 373748: Can you please help me to prove a tangent subtraction identity tan(a-b)=(tana-tanb)/(1+tana*tanb) using geometric techniques? Thank you so much!Answer by solver91311(16885)   (Show Source): You can put this solution on YOUR website! I don't know of a direct geometric proof of the tangent of a difference formula. I've always seen it done by geometric proofs of and and then using Geometric proofs of the sine and cosine of differences can be found at: Sine and Cosine of Difference Proofs Then the algebra to get it into the final form for tangent is found at: Sum/Difference Formulas (Scroll Down to TANGENT AħB) John My calculator said it, I believe it, that settles it