sin(5π/12)=

sin(5π/12)= 计算,sin(π/12)-sin(5π/12)+2sin(π/8)sin(3π/8) 若sin(π/4-α)=3/5 sin(π/4+β)=12/130 sin(π/4-a)=3/5,sin(π/4+b)=12/13,其中0 y=12sin(2x+π/6)+5sin(π/3-2x)最大值 y=12sin(2x+π/6)+5sin(π/3-2x)的最大值 化简sin(4π-a)*sin(5π-a)=? sin(α-π/4)=12/13,sinα= sin(-5π/12)是多少 sin(π/18)sin(5π/18)sin(-65π/18)= Sin（5π+α)=sin(π+α)=-sinα正确吗? sin(2π+a) ,sin(π+a),sin(5π+a) 的区别为什么sin(2π+a) =sina sin(π+a)=-sina 已知阿尔法,贝塔属于(3π/4,π),sin(阿尔法+贝塔)=-3/5,sin(贝塔-π/4)=12/13,则sin(阿尔法+π/4)= 已知sin(2α-β)=3/5,sinβ=-12/13,且α∈（π/2,π),β∈(-π/2,0)求sinα 函数y=sin(3x+π/12)sin(3x-5π/12)的最小正周期为 sin(a+b)=-3/5,sin(b-π/4）=12/13,求cos（a+π/4)值 函数y=12sin(2x-π/6)-5sin(2x+π/3)的最大值 sinπ/12*cosπ/12=?