sin(θ+105)cos(θ-15)-cos(θ+105)sin(θ-15)
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sin(θ+105)cos(θ-15)-cos(θ+105)sin(θ-15)sin(θ+105)cos(θ-15)-cos(θ+105)sin(θ-15)sin(θ+105)cos(θ-15)-co
sin(θ+105)cos(θ-15)-cos(θ+105)sin(θ-15)
sin(θ+105)cos(θ-15)-cos(θ+105)sin(θ-15)
sin(θ+105)cos(θ-15)-cos(θ+105)sin(θ-15)
sin(a-b)=sinacosb-cosasinb
代入后θ就会消掉
为根号3/2
sin(θ+105)cos(θ-15)-cos(θ+105)sin(θ-15)
(cosθ-sinθ)/(cosθ+sinθ)等于多少
sin(cosθ)是不是sin乘以cosθ呀
已知sinθ*cosθ
sinθ+cosθ最小值
若sinθ*cosθ
化简:1+sinθ+cosθ+2sinθcosθ /1+sinθ+cosθ
sinθcosθ+sinθ导数sinθcosθ+sinθ求导
化简 sin(θ+75°)+cos(θ+45°)+cos(θ+15°)化简题sin(θ+75°)+cos(θ+45°)+cos(θ+15°)
θ∈(0,π/2),比较cosθ、sin(cosθ)、cos(sinθ)的大小
求证sinθ/(1+cosθ)+(1+cosθ)/sinθ=2/sinθ
化简:cos平方(θ+15°)+sin平方(θ-15°)+sin(θ+180°)cos(θ-180°)
2sinθ-cosθ=1 (sinθ+cosθ+1)/(sinθ-cosθ+1)如题已知2sinθ-cosθ=1 求(sinθ+cosθ+1)/(sinθ-cosθ+1)
求值:sin(θ+75°)+cos(θ+45°)-√3cos(θ+15°)
求值:sin(θ+75°)+cos(θ+45°)-√3cos(θ+15°)
f(θ)=【sinθcosθ/(sinθ+cosθ+1)】+sinθcosθ化简
cos θ/(1-tan θ)怎样化成cos θ/[(cosθ-sinθ)/cosθ]
若sinθ*cosθ>0,cosθ