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Cos(A)+cos(2A)+cos(3A)=0 is not an identity​
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Cos(A)+cos(2A)+cos(3A)=0 is not an identity​

User Nicholas Koskowski
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Answer:

this is the required answer look it once

Cos(A)+cos(2A)+cos(3A)=0 is not an identity​-example-1
User Qwertmax
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