Mathematics, 11.11.2020 22:00, ioldelk123

Use cosacosb=1/2[cos(a+b)+cos(a-b)] to derive cosx+cosy=2cos(x+y/2)cos (x-y/2)

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Use cosacosb=1/2[cos(a+b)+cos(a-b)] to derive cosx+cosy=2cos(x+y/2)cos (x-y/2)
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