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3.2 Higher Order Partial Derivatives

Higher Order Partial DerivativesIffis a function of several variables, then we can find Higher Order partialsin the following (x,y)is a function of two variables, then f xand f yarealso functions of two variables and their partials can be taken. Hence we candifferentiate them with respect toxandyagain and find, 2f x2, the derivative offtaken twice with respect tox, 2f x y, the derivative offwith respect toyand then with respect tox, 2f y x, the derivative offwith respect toxand then with respect toy, 2f y2, the derivative offtaken twice with respect can carry on and find 3f x y2, which is taking the derivative offfirst withrespect toytwice, and then differentiating with respect tox, etc. In thismanner we can findnth- Order Partial Derivatives of a 2f x yand 2f y xare called mixed Partial Derivatives .

3.2 Higher Order Partial Derivatives If f is a function of several variables, then we can find higher order partials in the following manner. Definition. If f(x,y) is a function of two variables, then ∂f ∂x and ∂f ∂y are also functions of two variables and their partials can be taken. Hence we can

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