已知sin(西塔+丌/4)=1/3,西塔∈(丌/2,丌),求sin西塔
已知Sin(2x+pi/3)=1/3,求Sin(5Pi/6-4x),
已知sin(α+β)=2/3,sin(α-β)=3/5,sinα+sinβ=1/2,求cos[(α+β)/2]*sin[
已知sin(x+π/6)=1/3,求sin(5π/6-x)+sin^2(π/3-x)
已知sin(A+π/4)+sin(A-π/4)=根号2/3 1.求sinA的值 2.求【sin(A-π/4)】/【1-c
已知3SIN^2A+2SIN^2B=5SINA,求SIN^2A+SIN^2B范围
已知sin(π+α)=根号3/2,求sin(3/4π-α)
已知sin(π/4+2a)sin(π/4-2a)=1/4,a∈(π/4,π/2)求2sin方a+tana-cota-1
已知tanα=2,求sin^2α-3sinαcosα+1
已知sin(π/4+α)*sin(π/4-α)=1/4,α∈(π/4,π/2),求2sin^α+tanα-cotα-1的
已知tanα=1/2,求sinα,3sinαcosα的值
已知α∈(0,π|2),2tanα+3sinβ=7,且tanα-6sinβ=1,求sinα的值
已知α,β为锐角,且3sin²α+2sin²β=1,3sin²α-2sin(2β)=0,求