jayvickPaLoll jayvickPaLoll

26-11-2016
Mathematics

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

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Nirina7 Nirina7

30-11-2016

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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