Question

5. How to prove geometrically the identity : "Tan A - Tan B = (Tan A - Tan B) / (1 - Tan A. Tan B)?"  a) Without using any Sin or Cos ratio?  b) Without assuming any side as 1 unit?

Answer 1

Step 1

Given;

`TanA-TanB=\frac{(TanA-TanB)}{1-Tan\text{ A\lparen Tan B\rparen}}`

Step 2