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The polynomials a x^3+3x^2-3 and 2x^3-5x...

The polynomials `a x^3+3x^2-3` and `2x^3-5x+a` when divided by `(x-4)` leave the remainders `R_1a n dR_2` respectively. Find the values of a in each of the following cases
R1=R2
R1+R2=0
2R1-R2=0

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