Question

cos2theta + 2cos^2theta=2

Answer 1

kno any thing about square root

Answer 2

so we have 3cos^2theta=2

Answer 3

cos^2thetha=2/3

Answer 4

take the square root of both sides
costheta=2/3 and costhetha=-2/3

Answer 5

thetha=arccos(2/3) and thetha=arcsos(-2/3)

Answer 6

how did you get 3cos^2theta=2 if they aren't like terms so you can't combine them

Answer 7

oh I thought they were both raised to the second power my bad

Answer 8

i misread it

Answer 9

oh ok but do you understand it?

Answer 10

yes

Answer 11

give me just a sec

Answer 12

scanning right now

Answer 13

thanks

Answer 14

so it looks good?

Answer 15

yea, i got the same answer before doing it a different longer complex way but its good.

Answer 16

k