tan 8A = tan (6A +2A)
= tan6A + tan2A / 1- tan6A tan2A
crossmultiplying
tan8A - tan8A tan6A tan2A = tan6A + tan2A
tan8A - tan6A - tan2A = tan8A tan6A tan2A
Proved.......
1 Answers
Swarna Kamal Dhyawala
·2013-07-11 22:31:14