2019年GRE数学考点：Coefficient

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　　Coefficient

　　A constant multiplier of a variable is known as coefficient. They are
typically represented by letters a,b,c.

　　Example:

　　In the expression 3x+5,3 is the coefficient of x.

　　In the equation 4x+2y=6,4 is the coefficient of x and 2 is the coefficient
of y.

　　In the inequality 2*sin(x)+3>z,2 is the coefficient of the function
sin(x).

　　Remember:

　　Coefficient cannot change its value.