Question

find tan(x/2)

Answer 1

Find tan(x/2) when cos(x)= -60/61

Answer 2

@jim_thompson5910

Answer 3

@TuringTest

Answer 4

use this identity

\[\large \tan\left(\frac{\theta}{2}\right) = \frac{\sin(\theta)}{1+\cos(\theta)}\]

Answer 5

okay i think i got it but can you help me with this question ...

Answer 6

@jim_thompson5910

Answer 7

For part a), you will use this identity


\[\large \cos^2(u) - \sin^2(u) = \cos(2u)\]


Note: factor out the 2 first

Answer 8

For part b), you will use this identity


\[\large \cos(u)\sin(u) = \frac{1}{2}\sin(2u)\]

Answer 9

so would part a be