prove that: you will get 20 points
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answer to your question is
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Step-by-step explanation:
cos4a=cos2(2a)
=2cos^2a-1
=2(2cos2a)^2-1
=2(2cos^2a-1)^2-1
=2(4cos^4a-4cos^2a+1)-1
=8cos^4a-8cos^2a+2-1
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