If f (x) = 6arctan(3e^(x)),

  1. If f (x) = 6arctan(3e^(x)),find f '(x).
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    2. bobby asked by bobby
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  2. Determine over what interval(s) is the function y=4x-6arctan(x) is concave up/concave downI took the second derivative and ended
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    2. John asked by John
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