A constant value in a mathematical formula is a constant. If this constant exists as an independent term, then this term is called a constant term. If it is not a constant term, a constant value is combined with a variable in the form of product, then this constant is the coefficient of this variable, which is the constant coefficient, usually referred to as coefficient for short.

Limit is a concept related to variables, such as the limit of sequence, the limit of function,

The limit a of function f(x) is when x→x0 and f(x)→A exist, and a is the limit of function f(x) (the concepts of δ and ε are not introduced here, and the concept of δ ε is gradually abandoned).

The limit of a function is determined by its nature. When determining the limit value, some constants play an important role in the calculation of function value. such as

Find the function y=2x? The minimum value of +4,

When x=0, miny=4.

Find the function y =-2x? Maximum value of +3x+5,

If the derivative of y is equal to 0, y' =-4x+3 = 0 and x=0.75, substitute into the original function.

When x=0 .75, the maximum y=6. 125.

Some 0/0 and ∞ /∞ limit problems should be solved by Roberta's law, from which we can further understand the relationship between limit and constant.