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Prove cos(x+y)+cos(x-y)=2cosxcosy

Prove cos(x+y)+cos(x-y)=2cosxcosy
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Prove cos(x+y)+cos(x-y)=2cosxcosy

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User Mxb
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1 Answer

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Work shown above! Hope ya understand!
Prove cos(x+y)+cos(x-y)=2cosxcosy-example-1
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User Mattkgross
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