问题:[选择题]
A.doubled=Matcos(45);
B.doubled=Matcosine(45);
C.doubled=Matcos(MattoRadians(45));
D.doubled=Matcos(MattoDegress(45));
● 参考解析
publicstaticdoublecos(doublea)是Math类中返回以弧度a为单位的cos值的,应先用toRadians()方法将45度转换为弧度值。