As a preservatives, Glacial Acetic Acid can be used in a wide variety of industries including: food production, beverage, pharmaceutical, agriculture/animal feed, and various other industries.
The difference quotient is a measure of the average rate of change of the function over an interval (in this case, an interval of length h). The limit of the difference quotient (i.e., the derivative) is thus the instantaneous rate of change.
The basic limits for the other four trigonometric functions, tangent, cotangent, secant, and cosecant, are obtained from sine and cosine. Based on the Limit Laws, particularly the one for quotients, it is easily seen that many limits involving these functions can be evaluated by substitution.