Medal and follow if you can help me solve this. (cos θ + cos θ)^2 + (cos θ + cos θ)^2 a)sin2 θ b)4 c)8cos2 θ d)cos2 θ

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Medal and follow if you can help me solve this. (cos θ + cos θ)^2 + (cos θ + cos θ)^2 a)sin2 θ b)4 c)8cos2 θ d)cos2 θ

Mathematics
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\[(\cos(\theta) +\cos(\theta))^2 +(\cos(\theta)+\cos(\theta))^2= (2\cos(\theta))^2+(2\cos(\theta))^2\]
Ah okay so in my head i just got 8cos2 θ
is that correct in my math? I normally never make calculation mistakes

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yeah that's the correct answer, but can you explain to me how you got it?
I just did it in my head. Distributed it. Maybe i'm lucky?

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