Suppose w x. Differentiable at a and the total derivative is Dfa f1 x1 a f1 xn a. As a special application of the chain rule let us consider the relation defined by the two equations.
The derivative of a function of a single variable at a chosen input value when it exists is the slope of the tangent line to the graph of the function at that point.
D q d t q t X c s t u X q. F y 0 3y 2 3y 2. D q d t q t X c s t u X q. For a function of two variables z f x y the total differential of z is.