Practice free →
HomeUP Board Class 12 › Calculus › Using partial fractions, $\displaystyle\int \dfr…

Using partial fractions, $\displaystyle\int \dfrac{1}{(x-1)(x-2)}\,dx$ equals:

A$\log|(x-1)(x-2)| + C$
B$\dfrac{1}{2}\log\left|\dfrac{x-2}{x-1}\right| + C$
C$\log\left|\dfrac{x-2}{x-1}\right| + C$
D$\log\left|\dfrac{x-1}{x-2}\right| + C$
Answer & Solution
Correct answer: C. $\log\left|\dfrac{x-2}{x-1}\right| + C$
$\dfrac{1}{(x-1)(x-2)} = \dfrac{-1}{x-1} + \dfrac{1}{x-2}$ (since $A = 1/(1-2) = -1$ and $B = 1/(2-1) = 1$). Integrating term by term gives $-\log|x-1| + \log|x-2| + C = \log\left|\dfrac{x-2}{x-1}\right| + C$.
Solve this in the app — UP Board Class 12 practice & 24k+ MCQs →
Related questions