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Integrate 4/(1+x^2) dx on an integral of 0 to -1

Need help figuring this out.

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Kevin C. | Successful Math Tutor -- Recently retired high school math teacherSuccessful Math Tutor -- Recently retire...
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int (1/(1+u^2) du = arc tan u + c 

Therefore int (4/(1+x^2) dx = 4(arc tan x) evaluated from x = -1 to 0.

I hope this helps.

Kevin

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