若cosθ=-5/13,且θ∈(π/2.π),求sin(π-θ)+cos(-θ)的值

已知tanθ=3,求(3cosθ-5sin^2θcosθ)/sin(π-θ)的值 θ∈(0,π/2),比较cosθ、sin(cosθ)、cos(sinθ)的大小 已知θ∈(-π/2,0),cosθ=13,求sinθ+cos(θ-π/4)的值 已知θ∈(0,π/2)且满足关系logtanθ cosθ=3/2 求logcsc^2θ(sinθ*cosθ)的值. 已知θ∈（0,π/2),且满足关系logtanθCOSθ=2/3,求logcsc^2θ(sinθ*cosθ)的值 已知θ∈（0,π/2),且满足关系logtanθCOSθ=3/2 求logcsc^2θ(sinθ*cosθ)的值. 已知锐角θ满足sin(πcosθ)=cos(πsinθ) 求sin2θ的值? 已知向量m=(Cosθ,Sinθ)和n(根号2 -Sinθ,Cosθ),且Im+nl= 求Cos(θ/2+π/8) 已知sin(θ＋kπ)=2cos[θ＋（k+1）π],k∈Ζ,求4sinθ-2cosθ/5cosθ+3sinθ的值 已知sinθ+cosθ=1/5,且π/2≤θ≤3π/4,则cos^2-θsin^2θ的值 ①化简[sin(2π+α)*cos(7π-α)]/cos(-α)②已知cosθ=-3/5,θ∈(π/2,π),求sin( 已知向量m=(cosθ,-sinθ),n=(根号2+sinθ,cosθ),θ∈(π,3π/2),且cos(θ/2+π/8