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Question
Evaluate : `int 1/("x"^2 + 8"x" + 20)` dx
Sum
Solution
= `int 1/("x"^2 + 8"x" + 20)` dx
`= int 1/(("x + 4")^2 + 4)` dx
`= 1/2 "tan"^-1 (("x" + 4)/2) + "C"`
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