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March 29, 2017

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Find the integral from -∞ to -1 of 1/(1+x²) dx.

I started working the problem out, and so far I got the lim as z→-∞ of [arctan (-1) - arctan (z)].

I'm a little bit confused exactly what is means when you plug -∞ into z, and how to solve the problem from here.

Thank you!

  • Calc - ,

    The indefinite integral is arctan x, as you have already indicated.

    arctan(-infinity), the angle that has a tangent of -infinity, is (3/2)*pi

    arctan(-1) = (7/8)*(2 pi) = (7/4)pi

    That makes the answer pi/4

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