If the expression 4sin5alphacos3alphacos...

If the expression `4sin5alphacos3alphacos2alpha` s expressed as the sum of three sines then two of them are `sin4alpha\ a n d\ sin 10alphadot` The third one is- a.`sin8alpha` b. `sin6alpha` c.`sin5alpha` d. `sin\ 12alpha`

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