(sinθ-2)/(cosθ-3) 求此式子极值

(sinθ-2)/(cosθ-3) 求此式子极值 已知sinθ-cosθ=1/2,求sin^3θ-cos^3θ 已知2sinθ+3cosθ=2,求sinθ+cosθ的值 求此函数最大值100 [sinθcosθ - (√3 /3)sin²θ ] ( θ∈(0,π/3) ) 2sinθ+cosθ/sinθ-3cosθ=-5,求cos2θ+4sinθ 已知sinθ+sin^2θ=1,求3cos^2θ+cos^4θ-2sinθ+1 求2sinθ+√3cosθsinφ-cosθcosφ的最大值和最小值 2sinθ = cosθ + 1,怎么求sin 已知tanθ=2/3,求sin^2θ-2sinθcosθ+1的值sin^2θ-2sinθcosθ+1 = sin^2θ-2sinθcosθ+sin^2θ+cos^2θ----------------------------------------sin^2θ+cos^2这里为什么要加除数sin^2θ+cos^2, 求y=2|sinθ|+3|cosθ|值域 请会的大哥大姐多多指教.已知sinθ=(√5-1)/4(1)求(sinθ-cosθ)/(sinθ+cosθ)+(sinθ+cosθ)/(sinθ-cosθ)的值.(2)已知5sinθ+12cosθ=0,求(sinθ+9cosθ)/2(2-3sinθ)的值. 已知(4sinθ-2cosθ)/(3sinθ+5cosθ)=6/11,求5cos^2θ/(sin^2θ+2sinθcosθ-3cos^2θ) 求值:已知sinθ+cosθ=1/5,已知θ∈(0,π).求(1)sinθ*cosθ(2)sinθ-cosθ(3)tanθ 已知2sin(3π+θ)=cos(π+θ),求2sin^2 θ+3sinθcosθ-cos^2 θ 已知2sin(3π+θ)=cos(π+θ),求2sin^2 θ+3sinθcosθ-cos^2 θ 数学题三角函数已知2sin(3π+θ)=cos(π+θ),求2sin^2 θ+3sinθcosθ-cos^2 θ 已知2sin（3π+θ）=cos（π+θ）,求2sin²θ+3sinθcosθ-cos²θ的值. 2sinθ-cosθ=1 (sinθ+cosθ+1)/(sinθ-cosθ+1)如题已知2sinθ-cosθ=1 求(sinθ+cosθ+1)/(sinθ-cosθ+1)