Which standard result applies to 1/(x^2 - a^2)?
A(1/2a) log|(x + a)/(x - a)| + c
B(1/a) log|x^2 - a^2| + c
C(1/2a) log|(x - a)/(x + a)| + c
D(1/a) tan^-1(x/a) + c
Answer & Solution
Correct answer: C. (1/2a) log|(x - a)/(x + a)| + c
Splitting 1/(x^2 - a^2) into partial fractions gives (1/2a)[1/(x-a) - 1/(x+a)].
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