15.4.13 Math command

15.4.13.1 Sin — Sine

Explanation	sin() is used to calculate the sine of parameter x and return the result.
Definition	double sin(double x) x in radians; Return value: Return the calculated result between -1 and 1.

15.4.13.2 Cos — Cosine

Explanation	cos() is used to calculate the cosine of parameter x and return the result.
Definition	double cos(double x) x in radians; Return value: Return the calculated result between -1 and 1.

15.4.13.3 Tan — Tangent

Explanation	tan() is used to calculate the tangent of parameter x and return the result.
Definition	double tan(double x) x in radians; Return value: Return the tangent of parameter x.

15.4.13.4 Cot — Cotangent

Explanation	cot() is used to calculate the cotangent of parameter x and return the result.
Definition	double cot(double x) x in radians; Return value: Return the cotangent of the parameter x.

15.4.13.5 Asin — Arc sine

Explanation	asin() is used to calculate the arcsine of parameter x and return the result.
Definition	double asin(double x) Parameter x ranges from -1 to 1, beyond which error will be reported. Return value: Return the calculated result between -PI/2 and PI/2, in radians.

15.4.13.6 Acos — Arc cosine

Explanation	acos() is used to calculate the arccosine of parameter x and return the result.
Definition	double acos(double x) Parameter x ranges from -1 to 1, beyond which error will be reported; Return value: Return the calculated result between 0 and PI, in radians.

15.4.13.7 Atan — Arc tangent

Explanation	atan() is used to calculate the arctangent value of parameter x and return the result.
Definition	double atan(double x) Return value: Return the calculated result between -PI/2 and PI/2.

15.4.13.8 Sinh — Hyperbolic sine

Explanation	tanh() is used to calculate the hyperbolic tangent of parameter x and return the result.
Definition	double sinh(double x) The mathematical definition is: (exp(x) - exp(-x))/2; Return value: Return the hyperbolic sine of parameter x.

15.4.13.9 Cosh — Hyperbolic cosine

Explanation	cosh() is used to calculate the hyperbolic cosine of parameter x and return the result.
Definition	double cosh(double x) The mathematical definition is: (exp(x)+exp(x))/2; Return value: Return the hyperbolic cosine of the parameter x.

15.4.13.10 Tanh — Hyperbolic tangent

Explanation	tanh() is used to calculate the hyperbolic tangent of parameter x and return the result.
Definition	double tanh(double x) The mathematical definition is: sinh(x)/cosh(x); Return value: Return the hyperbolic tangent of parameter x.

15.4.13.11 Exp — Exponential

Explanation	exp() is used to calculate e to the x power, which is the e^x value, and return the result;
Definition	double exp(double x) Return value: Return the result of e to the x power.

15.4.13.12 Ln — Natural logarithm

Explanation	ln() is used to calculate the logarithm value of x at the base of e and return the result.
Definition	double ln(double x) Function description: Find the natural logarithm of x, ln(x), x > 0; Return value: Return the natural logarithm value of parameter x.

15.4.13.13 log10 — Common logarithm

Explanation	log10() is used to calculate the logarithm value of x at the base of 10, and return the result.
Definition	double log10(double x) Where x>0; Return value: Return the natural logarithm value of parameter x at the base of 10.

15.4.13.14 pow — Power

Explanation	pow() is used to calculate x to the y power, which is the xy value, and return the result;
Definition	double pow(double x, double y) Return value: Return the result of x to the y power.

15.4.13.15 sqrt — Square root

Explanation	sqrt() is used to calculate the square root of parameter x and return the result.
Definition	double sqrt(double x) The parameter x must be positive; Return value: Return the square root of parameter x.

15.4.13.16 ceil — Ceiling

Explanation	ceil() will return the minimum integer value no less than parameter x, and the result will be returned in the double type.
Definition	double ceil(double x) Return value: Return a minimum integer value not less than the parameter x.

15.4.13.17 floor — Floor

Explanation	floor() will return the maximum integer value not greater than the parameter x, and the result will be returned in the double type.
Definition	double floor(double x) Return value: Return the maximum integer value not greater than the parameter x.

15.4.13.18 abs — Absolute value

Explanation	Find the absolute value of x, |x|;
Definition	int abs(int x)/double abs(double x) Return value: When the input parameter is of int type, the output is also of int type. When the input parameter is of double type, the output is also.

15.4.13.19 rand — Random number

Explanation	To generate an integer random number;
Definition	rand() Return value: An integer random number, ranging from 0 to 2147483647.