Question

cos2 theta=cos^2(theta-1/2)

Answer 1

okay...

Answer 2

I need to solve it but im not even sure where to start

Answer 3

okay...
cos(2theta)
or cos^2(theta)

Answer 4

my book just says "solve the equation" so i guess both

Answer 5

first term is cos^2(theta) or cos(2theta)

Answer 6

cos(2theta)

Answer 7

okay....
cos^2+sin^2=1

Answer 8

cos^2(theta)=1-sin^2(theta)

Answer 9

and then what do i do with the right side of the equation?

Answer 10

sin^2(theta)=1/2-1/2cos(2theta)

Answer 11

cos^2(theta)=1-(1/2-1/cos2(theta)
cos^2(theta)=1-1/2+1/2cos(2theta)
cos^2(theta)=(1+cos(2theta)/2