计算,sin(π/12)-sin(5π/12)+2sin(π/8)sin(3π/8)
计算:sinπ12
计算cosπ/12*sinπ/12
比较大小(1)sin(-π/11)与sin(-π/17) (2)-sin(54π/7)与sin(-63π/8) (3)s
若sin(π3
sin(2π+a) ,sin(π+a),sin(5π+a) 的区别
【1】化简:sin(a-5π)/cos(3π-a)×cos(π/2-a)/sin(a-3π)×cos(8π-a)/sin
化简sin(α-5π)/cos(3π-α)×cos(π/2-α)/sin(α-3π)×cos(8π-α)/sin(-α-
sin(θ-5π)cos[(-π/2)-θ]cos(8π-θ)}/sin[θ-(3π/2)]sin(-θ-4π)
三角函数诱导公式已知sin(π+α)= -1/2,计算1.sin(5π-α)2.sin(π/2+α)3.cos(α- 3
sin²α+√3sinαcosα-2cos²α=0,α∈(π/6,5π/12),求:(1)sin(2
已知sin(x+π/6)=1/3,求sin(5π/6-x)+sin^2(π/3-x)
1-2sin²π/12