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4 February, 17:57

Find the second derivative of f (x) = sec (pix)

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  1. 4 February, 19:44
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    the main formula is (1/u) ' = - u' / u²

    f (x) = sec (pix) = 1 / cospix, f ' (x) = (1 / cospix) ' = pi sinpix / cos²pix
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