Question

show that sec^2 x/2 = 2/ 1+cos x

Answer 1

\[\cos2\theta=cos^2\theta-sin^2\theta\]
Use this..

Answer 2

ok i will try.thanks anyway :)

Answer 3

the last part i got stuck in 4/ 1+cos 2x.

Answer 4

\[cos2\theta = 2cos^2\theta - 1 \]
\[cos2\theta + 1 = 2cos^2\theta\]
\[\frac{1}{sec\theta}=cos\theta\]

Answer 5

Now you'll get it for sure (y) :)...

Answer 6

yeah i got it :) thanks dude.