sinα=4/5,π/2
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/03 09:54:54
sinα=4/5,π/2
sinα=4/5,π/2<α<π,则cos(π/6-α)
sinα=4/5,π/2
∵a是第二象限的角
∴ cosa<0
sina=4/5
cosa=-3/5
cos(π/6-a)=cos30cosa+sin30sina
=√3/2*-3/5+1/2*4/5
=4/10-3√3/10
=(4-3√3)/10
sinα=4/5,π/2
sin(α+π/6)=-4/5,α属于(-π/2,π/2),求sinα
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)
已知sin(α+π/3)+sinα=-4√3/5(-π/2
已知sinα=﹣4/5,求√2 sin(α+π/4)的值
化简sin(α+β)+sin(α-β)+2sinαsin(3π/2-β)=
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sin(3π+α)=2cos(α-4π)求cos(π/2 -α)+5sin(π/2 +α)/2cos(π+α)-sin(-α)
已知sin a=2cos a 计算⑴(sinα+2cosα)/(5cosα-sinα) ⑵tan(α+π/4)
sin(π/4+α)sin(π/4-α)=1/4 求2sin^2(a) -1+tana-1/tan
已知sinα-2cosα=10求(sinα-4cosα)/(5sinα+2cosα)
若(sinα+cosα)/(sinα-cosα)=2 则sin(α-5π)·sin(3π/2-α)=?
若sinα+cosα/sinα-cosα=2,则sin(α-5π)*sin(3π/2-α)等于?
若(sinα+cosα)/(sinα-cosα)=2,求sin(α-5π)sin(3π/2-α)的值
已知sin(x+π/6)=1/4,求sin(5π/6-x)+sin^2(π/3-x)
2sinα-3cosα/4sinα-9cosα=-1,则9sin^2α-3sinαcosα-5=
已知(tanα-3)(sinα+cosα +3)=0,求下列各式的值 4sinα-2sinα/5cosα+3sinα 2/3sin方α+1/4cos方α4sinα-2sinα/5cosα+3sinα2/3sin方α+1/4cos方α
sin0=0 sin(1/6π)=1/2sin(1/3π)=√3/2sin(1/2π)=1sin(2/3π)=√3/2sin(5/6π)=1/2sin(π)=0sin(-π)=0sin(-5/6π)=-1/2sin(-2/3π)=-√3/2sin(-1/2π)=-1sin(-1/3π)=-√3/2sin(-1/6π)=-1/2sin(7/6π)=-1/2sin(4/3π)=-√3/2sin(5/3π)=-√3/2sin(11/6π)=-1/