The partial fractions of frac{x^4 + 24x^2 + 2 | vedclass

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Question

(A) Let $\frac{x^4 + 24x^2 + 28}{(x^2 + 1)^3} = \frac{A_1 x + B_1}{x^2 + 1} + \frac{A_2 x + B_2}{(x^2 + 1)^2} + \frac{A_3 x + B_3}{(x^2 + 1)^3}$.Then,

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$\frac{1}{x^2 + 1} + \frac{22}{(x^2 + 1)^2} + \frac{5}{(x^2 + 1)^3}$

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(A) Let $\frac{x^4 + 24x^2 + 28}{(x^2 + 1)^3} = \frac{A_1 x + B_1}{x^2 + 1} + \frac{A_2 x + B_2}{(x^2 + 1)^2} + \frac{A_3 x + B_3}{(x^2 + 1)^3}$.Then,$x^4 + 24x^2 + 28 = (A_1 x + B_1)(x^2 + 1)^2 + (A_2 x + B_2)(x^2 + 1) + (A_3 x + B_3)$.Let $x^2 = y$. Then $\frac{y^2 + 24y + 28}{(y + 1)^3} = \frac{A}{y + 1} + \frac{B}{(y + 1)^2} + \frac{C}{(y + 1)^3}$.Let $y + 1 = t$,so $y = t - 1$. Then $y^2 + 24y + 28 = (t - 1)^2 + 24(t - 1) + 28 = t^2 - 2t + 1 + 24t - 24 + 28 = t^2 + 22t + 5$.Thus,$\frac{t^2 + 22t + 5}{t^3} = \frac{1}{t} + \frac{22}{t^2} + \frac{5}{t^3}$.Substituting $t = x^2 + 1$,we get $\frac{1}{x^2 + 1} + \frac{22}{(x^2 + 1)^2} + \frac{5}{(x^2 + 1)^3}$.

The partial fractions of $\frac{x^4 + 24x^2 + 28}{(x^2 + 1)^3}$ are

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