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August 28, 2016
Posted by **Anne** on Saturday, March 27, 2010 at 4:07pm.

*note: the exponents are just numbers. there are no variables in the exponents.

- trig -
**Anonymous**, Saturday, May 4, 2013 at 7:57amukgggg

- trig -
**Anonymous**, Monday, June 2, 2014 at 2:40amwe know tan2A= 2tanA / 1-tan2A

using this formula,

tan4x = tan2.(2x)

=2tan2x / 1-tan22x

= 2(2tanx/1-tan2x) / 1-(2tanx/{1-tan2x}2)

simplify to get. , 4tanx(1-tan2x) / 1-6tan2x+tan4x.