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Solve: int(x^(3)+1)/(x^(3)-5x^(2)+6x)dx.

Solve: x3+1x35x2+6xdx\int\frac{x^{3}+1}{x^{3}-5x^{2}+6x}\,dx.

Full solution

Q. Solve: x3+1x35x2+6xdx\int\frac{x^{3}+1}{x^{3}-5x^{2}+6x}\,dx.
  1. Simplify the integrand: Simplify the integrand if possible.\newlineThe integrand is a rational function. We can attempt to simplify it by factoring the denominator and seeing if there is a common factor that can be canceled with the numerator.\newlineThe denominator is x35x2+6xx^3 - 5x^2 + 6x. We can factor out an xx to get x(x25x+6)x(x^2 - 5x + 6).\newlineNow, we factor the quadratic: x25x+6=(x2)(x3)x^2 - 5x + 6 = (x - 2)(x - 3).\newlineSo, the denominator becomes x(x2)(x3)x(x - 2)(x - 3).\newlineThe numerator is x3+1x^3 + 1, which does not have any common factors with the denominator.\newlineTherefore, the integrand cannot be simplified by canceling common factors.
  2. Perform polynomial long division: Perform polynomial long division if the degree of the numerator is greater than or equal to the degree of the denominator.\newlineSince the degree of the numerator (33) is equal to the degree of the denominator (33), we can perform polynomial long division to simplify the integrand.\newlineHowever, in this case, the numerator is x3+1x^3 + 1, and the denominator is x35x2+6xx^3 - 5x^2 + 6x. The leading terms of the numerator and denominator are the same (x3x^3), so when we divide x3x^3 by x3x^3, we get 11.\newlineThe remainder will be the original numerator minus the product of the quotient (11) and the denominator, which is x3+1(x35x2+6x)x^3 + 1 - (x^3 - 5x^2 + 6x).\newlineThis simplifies to 3300.\newlineSo, the integral can be rewritten as the integral of 11 plus the integral of 3322.
  3. Break into partial fractions: Break the integral into partial fractions.\newlineWe have the integral of 11 plus the integral of (5x26x+1)/(x(x2)(x3))(5x^2 - 6x + 1) / (x(x - 2)(x - 3)).\newlineTo integrate the second part, we need to express it as a sum of partial fractions.\newlineWe assume that (5x26x+1)/(x(x2)(x3))(5x^2 - 6x + 1) / (x(x - 2)(x - 3)) can be written as A/x+B/(x2)+C/(x3)A/x + B/(x - 2) + C/(x - 3).\newlineMultiplying both sides by the denominator, we get 5x26x+1=A(x2)(x3)+Bx(x3)+Cx(x2)5x^2 - 6x + 1 = A(x - 2)(x - 3) + Bx(x - 3) + Cx(x - 2).\newlineWe will need to solve for AA, BB, and CC.
  4. Solve for AA, BB, and CC: Solve for AA, BB, and CC. To find AA, BB, and CC, we can plug in values for xx that simplify the equation. For AA, let BB11: BB22, so BB33. For BB, let BB55: BB66, which does not give us a value for BB or CC. This is a mistake; we need to choose values for xx that will eliminate two of the terms to solve for the remaining variable.

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