cos=-6/11,sin=?
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cos=-6/11,sin=?
为什么sin(?)=cos(?)
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
已知(4sinθ-2cosθ)/(3sinθ+5cosθ)=6/11,求5cos^2θ/(sin^2θ+2sinθcosθ-3cos^2θ)
已知(4sin a-2cos a)/(5cos a +3sin a)=6/11,求cos^4 a-sin^4 a
6sin^2α-sinαcosα-cos^2α=0,求cosα+sinα的值
cosπ/6=(),sinπ=()
求证:sin^2/(sin-cos) - (sin+cos)/(tan^2 -1) =sin+cos
sin^6+COS^6===sin^6+cos^6====
若sinα+cosα=1,求证:(sinα)^6+(cosα)^6=1
已知sinα+cosα=1 证明(sinα)^6+(cosα)^6=1
(1-sin^6a-cos^6a)/(1-sin^4a-cos^4a)=?
[1-(sinα)^4-(cosα)^4]/[1-(sinα)^6-(cos)^6)]=?
化简:sin^6α+cos^6α+3sin^2α*cos^2α=?
cos(6+a)cos(a-54)+sin(6+a)sin(a-54)=
sin^6 a+cos^6 a+3×sin^2 a×cos^2 a=?
当sinˆa+sin^2a=1求cos^+cos^6的值
sin^4+cos^4=1,求sin+cos=