证明cos4a+4cos2α+3=8cos^4α
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证明cos4a+4cos2α+3=8cos^4α
证明cos4a+4cos2α+3=8cos^4α
证明cos4a+4cos2α+3=8cos^4α
cos4a + 4cos2a
= 2(cos^2a - 1)^2 - 1 + 8cos^a - 4 + 3
= 8cos^a