Find the sum of all real roots of the biquadratic equation $x^{4} - 13 x^{2} + 36 = 0$ .

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If the polynomial $P (x) = x^{3} - a x^{2} + b x - 6$ is divisible by $(x - 1)$ and leaves a remainder of 8 when divided by $(x - 3)$ , find the val…
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