若cos2θ=√2/3,则sinθ^4+cos^4的值为

若cos2θ=√2/3,则sinθ^4+cos^4的值为 若sinθ=4/5,则cos2θ= 若sin(∏／2）,θ=3／5,则cos2θ=?错了，是sin（∏／2+θ）=3／5,则cos2θ=？ 若cos2θ=-3/4,则sin^4θ+cos^4θ= sin(π/4+θ)*sin(π/4-θ)=2/5,则cos2θ= cos2θ=根号2/3,则sin^4θ+cos^4θ= 若sin(π/2+θ）=3/5,则cos2θ=? 若sin(2分之派+Θ)=5分之3,则cos2Θ等于多少 已知sinθ/2+cosθ/2=2/3√3.则sinθ=? cos2θ=? cos2θ=√2/3,则cos^4-sin^4的值为cos2θ=(√2)/3,则cos^4 θ-sin^4 θ的值为________. 已知sin(π+θ)=-1/3则COS2θ 2sinθ+cosθ/sinθ-3cosθ=-5,求cos2θ+4sinθ 设sinθ+cosθ=-√2,则cos2θ=_______sin4θ=_______ 若θ∈(0,π),且sinθ+cosθ=1/3,则cos2θ 若3sinθ=cosθ,则cos2θ+sin2θ的值等于 若sin（θ/2）+cos（θ/2）=1/2,则cos2θ= 已知sinθ=3/5,θ∈(π/2,π),则cos2θ的值 sin（2π/3+θ）=3/5,则cos2θ=?