已知sin(π/4 -α)=5/13,则sin2α/cos(π/4 +α)=_______.
来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/08 21:39:19
已知sin(π/4-α)=5/13,则sin2α/cos(π/4+α)=_______.已知sin(π/4-α)=5/13,则sin2α/cos(π/4+α)=_______.已知sin(π/4-α)
已知sin(π/4 -α)=5/13,则sin2α/cos(π/4 +α)=_______.
已知sin(π/4 -α)=5/13,则sin2α/cos(π/4 +α)=_______.
已知sin(π/4 -α)=5/13,则sin2α/cos(π/4 +α)=_______.
原式=2sinαcosα/(√2/2cosα-√2/2sinα)
sin(π/4 -α)=5/13平方可得2sinαcosα=119/169
代入上式可得=(119/169)/(5/13)=119/65
已知sin((π/4)-α)=5/13,(0
已知sinα=-3/5,α是第四象限角,则sin(α-π/4)=
已知sinα(x+π/6)=1/4,则sin(5π/6-x)+sin(π/3-x)的平方=?
已知sin(π/4-α)=5/13,0
已知sin(π/4-α)=5/13,0
已知sin(π/4-a)=5/13…
已知α,β∈(3/4π,π),sin(α+β)=-3/5,sin(β-π/4)=12/13,则cos(α+π/4)=?
已知sinα=4分之5,求下列三角函数值 sin(-α) sin(派-α) sin(派+α) sin(2派-α)
1.已知tan(π+α)=3,则sin(π+α)×cos(π-α)= 2.已知sinα=根号5/5,则sinα的四次方-cosα的四次方=3..函数f(x)=sinπX/4,则f(1)+f(2)+...+f(2012)=4.已知sinα=1/3,则sinα的4次方-sinα的2次方+cosα的平方=
已知sinα=4/5,求下列三角函数值1)sin(-α)2)sin(π-α)3)sin(π+α)4)sin(2π-α)
已知tanα=2/3,求1/sinα-2sinαcosα+4cosα的值 已知已知tanα=2/3,求1/sinα-2sinαcosα+4cosα的值 已知π/4<α<3π/4,0<β<π/4,且cos(π/4-α)=3/5,sin(π/4+β)=5/13,求sin(α+β)的值
已知sin(α+ π/4)=√2/5,则sin2α=?
已知sin(α-π/4)=5/13 阿尔法∈(3π/4,π/4).求sinα的值
已知cos(π-2α)/sin(α-π/4)=根号2/2则cosα+sinα
已知cos(α-π/6)+sinα=(4倍根号3)/5,则sin(α+7π/6)=
已知sin(π/6-α)=1/4,则sin(π/6+2α)=(),
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sinα+cosα=(√6)÷2,则sin(α-5π/4)=