Question

let sin4theta=1/2 and tan4theta>0, find cos2theta

Answer 1

\[\sin 4\theta = \sin \Pi/6\]

Answer 2

\[\theta=\Pi/24\]

Answer 3

book says \[1/2\sqrt{2+\sqrt{3}}\]

Answer 4

lol sorry misunderstanding..

Answer 5

we are looking for cos2(theta)

Answer 6

wait...lol

Answer 7

ok :)

Answer 8

\[\cos2\theta = 1-2\sin^2\]

Answer 9

use this

Answer 10

@Yahoo! \(\theta\) is only \(\large\frac{\pi}{24}\) and not \(\sin \theta\)

Answer 11

thank you :)

Answer 12

oh..sorryyy

Answer 13

\[\sin \Pi/24\]

Answer 14

yw...

Answer 15

it's k.:)