cos12π/5=cos(2π+2π/5)=cos2π/5
cos11π/2=cos(6π-π/2)=cos（-π/2)=cosπ/2=0
cos12π/5的值和cos11π/2的值
2个回答
相关问题
-
求值cosπ/11*cos2π/11*cos3π/11*cos4π/11*cos5π/11
-
RT,求值cosπ/11*cos2π/11*cos3π/11*cos4π/11*cos5π/11
-
求cosπ/11乘cos2π/11乘cos3π/11乘cos4π/11乘cos5π/11的值
-
高一数学解答 !急!三角函数sin25π/12·cos11π/6-cos11π/12·sin5π/6 的值是A -√2/
-
cosπ5cos2π5的值等于（ ）
-
求cos(π/11)cos(2π/11)cos(3π/11)cos(4π/11)cos(5π/11)
-
三角函数的计算（cos12/π－sin12/π）（cos12/π＋sin12/π）的值等于多少.
-
求解高一的三角函数化简题(cosπ/11)(cos2π/11)(cos3π/11)(cos4π/11)(cos5π/11
-
求cos(π/2+α)sin(-π-α) / cos(11π/2 -α)sin(9π/2+α)的值
-
求下列三角函数值 1.sin11π/6 2.sin3π/5 3.sin(-5/3π) 4.cos(-11/9π) 5co