SINα=2/3 则COS(π-2α)=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/14 14:42:02
x);HXiLg`
F6j$/!YH83/Q3HldU6yvP+l^jb ȰՍ63yZ@P%] 6\
SINα=2/3 则COS(π-2α)=?
SINα=2/3 则COS(π-2α)=?
SINα=2/3 则COS(π-2α)=?
COS(π-2α)=2(sina)^2-1
SINα=2/3 COS(π-2α)=-1/9
sinα=2/3
cos(π-2α)=-cos2α=-[1-2(sinα)^2]=-1+2(sinα)^2=-1+2*(2/3)^2=-1+8/9=-1/9
3sinα=2cosα,则 cosα-sinα/cosα+sinα/ cos3sinα=2cosα,则cosα-sinα/cosα+sinα/cosα+sinα/cosα-sinα
已知3sinα=cosα,则sinα-2sinαcosα+3cosα+1=
已知sin(3π-α)=-2sin(π/2+α)则sinαcosα
sinα+cosα/sinα-cosα =2 则2sin^2α-3sinαcosα-3cos^2α的值
设角a=-35π/6,则2sin(π+α)cos(π-α)-cos(π+α)/ 1+sin^2α+sin(π-α)-cos^2(π+α)sina=sin(-35π/6)=sin(-6π+π/6)=1/2 cosα=根号3/22sin(π+α)cos(π-α)-cos(π+α)/ [1+sin^2α+sin(π-α)-cos^2(π+α)]=2(-sinα)(-cosα)+cosα/[1+sin²
已知sin(7π-α)-3cos(3π/2+α)=2,则(sin(π-α)+cos(π+α))/(sinα+cos(-α))的值是
已知sin(7π-α)-3cos(π-α)=2,则(sin(π-α)+cos(π+α))/(sinα+cos(-α))的值是
已知sin(7π-α)-3cos(π-α)=2,则(sin(π-α)+cos(π+α))/(sinα+cos(-α))的值是
tanα=3,则sin^2α-3sinαcosα+cos^α=?
2sinα-cosα=根号3 ×sinα,则cos α=
2sinα-cosα=根号3sinα,则cosα
若1+cosα/sinα=2 则cosα-3sinαRT...
若(sinα+cosα)/(sinα-cosα)=2 则sin(α-5π)·sin(3π/2-α)=?
sinα=-2cosα,求sin^2α-3sinαcosα+1
若sinα+cosα/sinα-cosα=2,则sin(α-5π)*sin(3π/2-α)等于?
sinα+cosβ=1/2,则sin^3α+cos^3β=
已知tanα=-3则7sinα-3cos/4sinα+5cosα=2sinαcosα-3cos^2α=
2sinα-3cosα/4sinα-9cosα=-1,则9sin^2α-3sinαcosα-5=