Trigonometry

Have you tried applying the formula twice?

tg(4θ) = tg(2(2θ)), so you can replace θ with 2θ in the formula and simplify.
 
Please follow the guidelines of posting in this forum enunciated at:


One of the most important rule is:

"Show some of your work or explain where you're stuck "

This is your 4th post- you ought to know better.

Hint: To start off:

Substitute Φ = 2*Θ

Then tg(4Θ) = tg(2Φ) ..... and continue.....
 
Top