The quartic square product of yx is divided into X 5/5+C. According to the relevant information, it is usually divided into definite integral and indefinite integral. Yx quartic integral, the formula ends with X 5/5+C. For a given positive real function, the definite integral in the real number interval can be understood as the area value (a definite real value) of the curve trapezoid surrounded by curve, straight line and axis on the coordinate plane. Bernhard Riemann gave a strict mathematical definition of integral (see the entry "Riemann integral"). Riemann's definition uses the concept of limit, imagining a curved trapezoid as the limit of a series of rectangular combinations.