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# Function value calculation

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This page calculates the function value of a function represented by an expression. First enter the function expression in the function definition edit box, then enter the value of the argument x in the argument edit box, and then click the "start calculation" button to calculate the function value of the corresponding function at x. An expression is a string of characters, where the characters +, -, *, /, ^ represent the operations of addition, subtraction, multiplication, division, and power, and combine some constants. The letters e and p represent the nature of mathematical operations. The base e and the pi of the logarithm can also be added with some functions. The parentheses can be used to change the priority of the calculation. The function expression can be added to the argument character x, and the argument edit box can be used to input a constant expression.   The list of supported functions is as follows (where x, a, b all represent any number, variable or constant expression):

 sin(x) Sine cos(x) Cosine asin(x) Arc sine acos(x) Inverse cosine tan(x) Tangent atan(x) Arc tangent exp(x) exponential function log(x) Logarithm sqrt(x) Square root rand(x) (0,1) random number LE(a,b) less than or equal to，returns 1 when a<=b, otherwise returns 0 LT(a,b) less than，returns 1 when a<=b, otherwise returns 0 GE(a,b) greater or equal to，returns 1 when a>=b, otherwise returns 0 GT(a,b) greater than, a1 returns b, otherwise returns 0 abs(x) absolute value gam(x) gamma function max(a,b) Maximum value of a, B min(a,b) Minimum values of a and B