Partial Fractions

Express \displaystyle \frac{3x+3}{\left(x-1\right)\left(x+2\right)} in partial fractions and hence, or otherwise, find the third differential coefficient of this fraction.

Source: Porter, R.I. (1963). Further Elementary Analysis (2nd ed.). London: G. Bell & Sons. (Miscellaneous Examples, Question 7, p. 221)

Author: ascklee

Dr. Lee teaches at the Wee Kim Wee School of Communication and Information at the Nanyang Technological University in Singapore. He founded The Mathematics Digital Library in 2013.

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