设f( θ)=2cos^3θ + sin^2 (2π-θ)+cos(-θ)-3 / 2+2cos^2(π+θ) + co
θ∈(0,π/2),比较cosθ、sin(cosθ)、cos(sinθ)的大小
已知(4sinθ-2cosθ)/(3sinθ+5cosθ)=6/11,求5cos^2θ/(sin^2θ+2sinθcos
sin(π-θ)+cos(2π-θ)/cos(5π/2-θ)+sin(3π/2+θ)=2,则sinθcosθ=_____
已知 sin(θ+kπ)=-2cos (θ+kπ) 求 ⑴4sinθ-2cosθ/5cosθ+3sinθ; ⑵(1/4)
化简:1+sinθ+cosθ+2sinθcosθ /1+sinθ+cosθ
求f(x)=sin^2θ+2sinθ*cosθ+3cos^2θ的最小值
设f(α)=2sinαcosα+cosα/1+sin²α+cos(3π/2+α)-sin²(π/2+
已知2sinθ+3cosθ=2,求sinθ+cosθ的值
sinθ-cosθ=1/2,则sin^3θ-cos^3θ=?.
已知sinθ+2cosθsinθ−cosθ=3,求值:
设sinθ+cosθ=√2/3,π/2
已知向量m=(cosθ,-sinθ),n=(根号2+sinθ,cosθ),θ∈(π,3π/2),且cos(θ/2+π/8