Home/Differential Calculus/Notation/Formula6.1. NotationFormulaIn 6.1. NotationFormulaCopy LaTeXddx[dydx]=d2ydx2\frac{d}{dx}\left[\frac{dy}{dx}\right]=\frac{d^2y}{dx^2}dxd[dxdy]=dx2d2yTagsDifferential calculusDerivativeNotationDerivative formulaVariablesf′f'f′Derivative of fffyyyDependent variabledydydyDifferential of yyydxdxdxDifferential of xxxFound an error? Contact us.Related formulasRelatedFormulaf′′(x)=d2fdx2,f(n)(x)=dnfdxnf''(x)=\frac{d^2f}{dx^2},\qquad f^{(n)}(x)=\frac{d^nf}{dx^n}f′′(x)=dx2d2f,f(n)(x)=dxndnfOpen formulaOpen in section