Question

tan2A-tanA/tanA=sec^2A​

Answer 1

Answer:

tan2a= 2 tan a /1-tan^2 a

=tan2a/tana-1

=2/1-tan^2 a -1

=(2-1+tan^2 a)/1- tan^2 a

sec^2 a / 1-tan^2 a