Question

Could someone show me how to solve this step by step (cos Θ + cos Θ)^2 + (cos Θ + cos Θ)^2

Answer 1

@PRAETORIAN.10

Answer 2

@UnkleRhaukus

Answer 3

\[(\cos\theta + \cos\theta)^2 + (\cos\theta + \cos\theta)^2\\
=(2\cos\theta)^2 + (2\cos\theta)^2\\
= 2(2\cos\theta)^2\\
= 2(4\cos^2\theta)\\
= 8\cos^2\theta\]

Answer 4

thank you so much you are a legend

Answer 5

now did you use foil for this

Answer 6

i did not use foil,

Answer 7

ok one last question how did you get 2(4cos^2)theta

Answer 8

\[(\cos\theta + \cos\theta)^2 + (\cos\theta + \cos\theta)^2\\
=(2\cos\theta)^2 + (2\cos\theta)^2\\
= 2(2\cos\theta)^2\\
= 2(2^2\cos^2\theta)\\
= 2(4\cos^2\theta)\\
= 8\cos^2\theta\]

Answer 9

Using foil:\[(\cos\theta + \cos\theta)^2 + (\cos\theta + \cos\theta)^2\\
=(\cos^2\theta+\cos^2\theta +\cos^2\theta+\cos^2\theta) + (\cos^2\theta+\cos^2\theta+\cos^2\theta+\cos^2\theta)\\
= (4\cos^2\theta)+(4\cos^2\theta)\\
= 8\cos^2\theta\]

Answer 10

oh ok that makes sense thank you so much im going to add this to my notebook :D