How do you find the value of tan 20(theta) using the double angle identity?

1 Answer
Oct 11, 2017

Have a look.

Explanation:

For solving this, one should be aware of the formula rarr

tan2theta=(2tantheta)/(1-tan^2theta)

So, tan(20theta)

=tan(2xx10theta)

=(2tan(10theta))/(1-tan^(2)(10theta)

=(2tan(2xx5theta))/(1-(tan(2xx5theta))^2)

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

Hope it Helps:)