How do you find the value of tan20(θ) using the double angle identity?

1 Answer
Oct 11, 2017

Have a look.

Explanation:

For solving this, one should be aware of the formula

tan2θ=2tanθ1tan2θ

So, tan(20θ)

=tan(2×10θ)

=2tan(10θ)1tan2(10θ)

=2tan(2×5θ)1(tan(2×5θ))2

In this way continue till you get an expression having only the term 5θ.

Hope it Helps:)