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Cos4 A = 8 cos⁴A - 8 Cos²A+I |
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Answer» ong>Answer: LHS= Cos4A=Cos2(2A) 2Cos^2A-1 2(2Cos^2A-1)^2-1 2(4Cos^4A+1-4Cos^2A)-1 8cos^4A+2-8Cos^2A-1 8Cos^4A-8Cos^2A-1=RHS Hence PROVED |
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