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anonymous
 one year ago
MEDAL
SOLVE
(cos Θ − cos Θ)2 + (cos Θ + cos Θ)2
anonymous
 one year ago
MEDAL SOLVE (cos Θ − cos Θ)2 + (cos Θ + cos Θ)2

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zepdrix
 one year ago
Best ResponseYou've already chosen the best response.2Hey 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 liketerms.\[\Large\rm (\cos \theta\cos \theta)^2+(\cos \theta+\cos \theta)^2\]\[\Large\rm (0)^2+(2\cos \theta)^2\]

zepdrix
 one year ago
Best ResponseYou've already chosen the best response.2And then square both the 2, and the cosine.

zepdrix
 one year ago
Best ResponseYou've already chosen the best response.2No you still need to square the 2cos(theta).\[\Large\rm (2\cos \theta)^2=2^2\cos^2\theta\]
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