求下列三角函数值 1.sin11π/6 2.sin3π/5 3.sin(-5/3π) 4.cos(-11/9π) 5cos(-17/4)π

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/29 10:04:32
求下列三角函数值1.sin11π/62.sin3π/53.sin(-5/3π)4.cos(-11/9π)5cos(-17/4)π求下列三角函数值1.sin11π/62.sin3π/53.sin(-5/

求下列三角函数值 1.sin11π/6 2.sin3π/5 3.sin(-5/3π) 4.cos(-11/9π) 5cos(-17/4)π
求下列三角函数值 1.sin11π/6 2.sin3π/5 3.sin(-5/3π) 4.cos(-11/9π) 5cos(-17/4)π

求下列三角函数值 1.sin11π/6 2.sin3π/5 3.sin(-5/3π) 4.cos(-11/9π) 5cos(-17/4)π
1.sin11π/6=-1/2
2.sin3π/5 =sin72°
3.sin(-5/3π) =根号3/2
4.cos(-11/9π) =cos2/9π
5cos(-17/4)π=根号2/2