sinθ·cosθ=1/8; 且π/4
sinθcosθ=1/8; 且派/4
sinθ·cosθ=1/8; 且π/4
已知sinθ=4/5,且sinθ+cosθ>1,sin2θ=
若θ为锐角,且sinθcosθ=1/4,则sinθ+cosθ等于
已知sinθ+cosθ=1/5,且π/2≤θ≤3π/4,则cos^2-θsin^2θ的值
sinα·cosα=1/8,且π/4
已知向量m=(cosθ,-sinθ),n=(根号2+sinθ,cosθ),θ∈(π,3π/2),且cos(θ/2+π/8
已知向量m=(Cosθ,Sinθ)和n(根号2 -Sinθ,Cosθ),且Im+nl= 求Cos(θ/2+π/8)
2sin(π/4+a)=sinθ+cosθ,且2sin^2b=sin2θ,求sin2a+1/2cos2b
cosθ/(1+cosθ)=-4,且(1/2)^sinθ>1,求tan(θ/2)
cosθ/(1+cosθ)=-4,且(1/2)^sinθ>1,求tan(θ/2)的值
已知 sinθ =4/5,且 sinθ-cosθ>1,则 sin2θ=