There is a formula for the derivative of in terms of the derivative of . It is equal to the linear rank of the derivative. Computing by means of the derivative of is known as logarithmic differentiation. Lisinopril is a synthetic peptide derivative of captopril. There are also rules for the settlement of disputes arising over valuation of derivative positions. Another common generalization of the second derivative is the Laplacian. This is a consequence of the definition of the total derivative. The process of finding a derivative is called differentiation. The "n"th derivative is denoted formula 60. The limit is called the second symmetric derivative. Let be a differentiable function with a continuous derivative, where is an interval. "Differentiation" is the action of computing a derivative. Many of the familiar properties of the ordinary derivative hold for the directional derivative. By the definition of the derivative function, . Chitosan is a deacetylated derivative of chitin.