Question

MEDAL
SOLVE
(cos Θ − cos Θ)2 + (cos Θ + cos Θ)2

Answer 1

Hey there :)
Unless your teacher wants you to do this a specific way,
notice that you have a cosine minus cosine, which gives you zero there.

And in the other brackets, simply combine your like-terms.\[\Large\rm (\cos \theta-\cos \theta)^2+(\cos \theta+\cos \theta)^2\]\[\Large\rm (0)^2+(2\cos \theta)^2\]

Answer 2

And then square both the 2, and the cosine.

Answer 3

0 +2cos

Answer 4

No you still need to square the 2cos(theta).\[\Large\rm (2\cos \theta)^2=2^2\cos^2\theta\]

Answer 5

8

Answer 6

it is 4cos^2 theta

Answer 7

yes.