What is the derivative of arctan(x/2)?? I had a test today, so I eliminated some of the MC answers, and I guessed it was 2/x^2+4, but didn't show my work.. How do I do this?
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Yeah so the derivative of arctan(x) is 1/(x^2+1) If you have arctan(x/2) you can use the chain rule: (d/dx) arctan(x/2) = [1/([x/2]^2+1)]*(1/2) = 1/([x^2]/2+1) -> so you got it right
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