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Question
Integrate the functions:
`(2x)/(1 + x^2)`
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Solution
Let I `= int (2x)/(1 + x^2)`
Taking = 1 + x2
2x dx = dt
∴ `I = int (2x)/(1 + x^2) dx int 1/t dt`
I = log t + C = log (1 + x2) + C
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