Partial fractions with many coefficients and integral equivalence

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Miike012
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Question:
When determining the coefficients of the partial fractions for say 5 or more coefficients... Do you find it easiest to set up linear equations and solving? Any advice would be appreciated...

Next question.. look in paint doc... why would I3 not be equal to I21??
 

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Miike012 said:
Question:
When determining the coefficients of the partial fractions for say 5 or more coefficients... Do you find it easiest to set up linear equations and solving? Any advice would be appreciated...

Next question.. look in paint doc... why would I3 not be equal to I21??

regarding your 2nd question, because a^2+b^2≠(a+b)^2