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If the expression 4sin5alphacos3alphacos...

If the expression `4sin5alphacos3alphacos2alpha` is expressed as the sum of threes sines then two of them are `sin4 alpha` and `sin10alpha`. The third one is (a)sin`8alpha` (b)sin`6alpha` (d)sin`5alpha` (d)sin`12alpha`

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