三角方法 sin(double a) cos(double a) tan(double a) acos (double a) asin(double a) atan (double a) ©2006计算机系杨厚群 All rights&lefts reserved.©2006 计算机系 杨厚群 All rights & lefts reserved. – sin(double a) – cos(double a) – tan(double a) – acos(double a) – asin(double a) – atan(double a) 三角方法