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| 1. |
Pro that tan A+tanB/cotA+cotB=tanA tanB |
| Answer» Tan A+Tan B/1/Tan A+1/Tan B=Tan A+Tan B/ Tan A+Tan B/Tan A*Tan B=Tan A*TanB (as tanA+tanB and tanA + tanB gets cancelled) hence proved. | |