已知角(11π )/ 2 ,其正弦值是?
问题描述:
已知角(11π )/ 2 ,其正弦值是?
答
sin(11/2π)=sin(11/2π-6π)=sin(-1/2π)=-sin(1/2π)=-1
已知角(11π )/ 2 ,其正弦值是?
sin(11/2π)=sin(11/2π-6π)=sin(-1/2π)=-sin(1/2π)=-1