What is the solution of the mentioned problem?

Prove that,tan3atan2atana=tan3a-tan2a-tana

1 Answer
Dec 18, 2017

See below.

Explanation:

tan(3a)tan(2a)tana=tan(3a)-tan(2a)-tana

is not an identity so we cannot prove it.

We can solve as an equation. In this case we obtain

tan(3a)tan(2a)tana-tan(3a)+tan(2a)+tana=2(2+sec(2a))tana = 0

and the solutions are those a such that

{(sec(2a) + 2=0),(tan(a)=0):} or

{(cos(2a) + 1/2=0),(tan(a)=0):}