- #1

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Show that :

__= 1/6ln(7/4) where the limits are : b = 5 and a = 4__

__dx__x^2 -9

I know that if the denominator was x^2 + 9 I could use 1/a tan-1 x/a + C . But do not know how to attempt this - does it involve the substitution of a trig identity, if so which one...? Thank you.