Question

If cos2(theta) =1, a value of theta is...

Answer 1

\[\cos2\theta=1 \]

Answer 2

\[or, \cos 2\theta=\cos 0\]

Answer 3

\[or, 2\theta=0\]

Answer 4

\[or, \theta=0\]

Answer 5

sorry i dont understand, 0 isn't one of the choices

Answer 6

ok

Answer 7

trying again

Answer 8

Well then you should list the choices for us, because 0 is indeed a possibility.

Answer 9

show me choices

Answer 10

45,90,180,270

Answer 11

\[\cos 2\theta=1\]

Answer 12

those are all in degrees

Answer 13

\[or, \cos 2\theta=\cos 360\]

Answer 14

\[or, 2\theta=360\]

Answer 15

\[or, \theta=180\]

Answer 16

so 0 and 180 are the only possibilities?

Answer 17

no

Answer 18

many more possibilities

Answer 19

360 degree is another possib

Answer 20

its infinite number of possibilities

Answer 21

thanks

Answer 22

sorry i was trying to understand it, had to scroll up a few times, was going to thank you lol, so Thanks :)

Answer 23

i m going to bathroom. coming soon

Answer 24

did u understand my solution

Answer 25

cos2(theta)=360
cos(theta)=180

Answer 26

no

Answer 27

its not the right way

Answer 28

please explain

Answer 29

sorry

Answer 30

it was my mistake

Answer 31

i wanna solve it again

Answer 32

ok, take your time

Answer 33

\[\cos2\theta=\cos360\]

Answer 34

\[2\theta=360\]

Answer 35

\[or, \theta=180\]

Answer 36

do u need any more help

Answer 37

i understand now, thankyou!