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If (x^2 - xcos(A + B) + 1) is a factor ...

If `(x^2 - xcos(A + B) + 1)` is a factor of the expression, `2x^4 + 4x^3 sinAsinB - x^2(cos2A + cos2B) + 4xcosA cosB - 2`, then the other `ax^2 + bx + c`. Find the value of `(a +b+c)` given `A =(3pi)/8 and B = pi/24`

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