Java mathematical functions common methods in math class __ function

The Math class provides a number of commonly used mathematical functions, such as trigonometric, logarithmic, exponential, and so on. A mathematical formula if you want to represent it in code, you can split it and then apply the method under the Math class.

		
		Math.Abs (12.3);				12.3 Returns the absolute value of this number Math.Abs (-12.3);		12.3 Math.copysign (1.23,-12.3);		-1.23, returns the measure of the first parameter and the symbol math.copysign (-12.3, 1.23) of the second parameter;					12.3 Math.signum (x);				If x is greater than 0, then returns 1.0, less than 0 returns-1.0, or 0 returns 0 Math.signum (12.3);				1.0 math.signum (-12.3);					-1.0 math.signum (0);					0.0//Index MATH.EXP (x);					X power MATH.EXPM1 (x) of E;				x power of E-1 math.scalb (x, y);			x* (y power of 2) Math.scalb (12.3, 3);				12.3*2³//the whole Math.ceil (12.3);				Returns the nearest integer 13.0 Math.ceil (-12.3) that is greater than this number;				-12.0 Math.floor (12.3);				Returns the nearest integer 12.0 Math.floor (-12.3) that is less than this number;				-13.0//x and y squared sum of two square root math.hypot (x, y);					√ (x²+y²)//Returns an overview of the two square root math.sqrt (x);					√ (x) x two square root math.sqrt (9);					3.0 math.sqrt (16);				4.0//Returns the cubic root math.cbrt (27.0) of the number;				3 MATH.CBRT (-125.0);					-5//Logarithmic function Math.log (e);				1 logarithm math.log10 (100) with the e as the base;					10 logarithmic math.log1p (x) with a 10 base; Ln (x+ 1)//returns a larger value and a smaller value Math.max (x,y);					Returns the larger number math.min (x, y) in X and y;					
		Returns the smaller number in X, Y//returns the Y-power Math.pow (x, y) of X;					Math.pow (2, 3);					
		
		That is, 2³ returns: 8//random return of the unsigned Double value math.random () between [0,1];				Returns the integer closest to this number, or even math.rint (12.3) If it is just centered;				12.0 Math.rint (-12.3);				-12.0 Math.rint (78.9);				79.0 Math.rint (-78.9);				-79.0 Math.rint (34.5);				34.0 Math.rint (35.5);				36.0 Math.Round (12.3);					Similar to Rint, the return value is long//trigonometric Math.sin (alpha);					The value of sin (α) math.cos (Alpha);					The value of cos (α) is Math.tan (alpha);					Tan (α) value//Angle Math.asin (x/z);					Returns the angle value [-Π/2,Π/2] arc sin (x/z) math.acos (y/z);					Returns the angular value [0~π] arc cos (y/z) Math.atan (y/x); 		Returns the angle value [-Π/2,Π/2] math.atan2 (y-y0, x-x0);					Ibid., returns the angle between the line between the point (X,y) and the origin and the line between the point (X0,y0) and the Origin Math.sinh (x);
		Hyperbolic sine function sinh (x) = (exp (x)-exp (-X))/2.0;					Math.cosh (x);
		Hyperbolic cosine function cosh (x) = (exp (x) + exp (-X))/2.0;					Math.tanh (x);
		
		Tanh (x) = Sinh (x)/cosh (x);			Angle Radian Interchange Math.todegrees (Angrad); Angle converted to radians, return: Angrad * 180d/pi Math.toradians (angdeg);
		 Radians converted to angles, back: angdeg/180d * PI