已知cos2θ=根号2/3,则 sin^4θ+cos^4θ的值为________.
已知cos2θ=根号2/3,则 sin^4θ+cos^4θ的值为________.
1.已知cos2θ=根号2/3,则sin^4+cos^4的值为________.
若cos2θ=√2/3,则sinθ^4+cos^4的值为
cos2θ=√2/3,则cos^4-sin^4的值为
cos2θ=根号2/3,则sin^4θ+cos^4θ=
已知cos2θ=3/5,求sin^4θ+cos^4θ的值.
已知sinθ/2+cosθ/2=2根号3/5,则sinθ= ,cos2θ=
已知θ为第二象限角,sinθ+cosθ=根号3/3,则cos2θ=
已知2cosθ-sinθ=0 求3cos2θ+4sin2θ的值
已知sinθ+cosθ=2sinα,sinθcosθ=(sinβ)^2,求证4(cos2α)^2=(cos2β)^2
已知sinθ-2cosθ=0,求sin2θ-cos2θ/sinθ*cosθ 的值
已知sinθ+cosθ=1/5,且π/2≤θ≤3π/4,则cos2θ的值