cos(a+b) = cos(a)cos(b) + sen(a)sen(b)
cos(a-b) = cos(a)cos(b) - sen(a)sen(b)
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cos(a+b) + cos(a-b) = 2cos(a)cos(b)
se a= 4x e b=2x
cos(4x + 2x) + cos(4x - 2x) = 2cos(2x)cos(4x)
cos(6x) + cos(2x) = 2cos(2x)cos(4x)
cos(2x)cos(4x) = (cos(6x) + cos(2x))/2
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Verified answer
cos(a+b) = cos(a)cos(b) + sen(a)sen(b)
cos(a-b) = cos(a)cos(b) - sen(a)sen(b)
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cos(a+b) + cos(a-b) = 2cos(a)cos(b)
se a= 4x e b=2x
cos(4x + 2x) + cos(4x - 2x) = 2cos(2x)cos(4x)
cos(6x) + cos(2x) = 2cos(2x)cos(4x)
cos(2x)cos(4x) = (cos(6x) + cos(2x))/2