sin^2(θ)+4cosθ/sin(90-θ) -1/tan(90-θ)
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/25 22:34:26
sin^2(θ)+4cosθ/sin(90-θ)-1/tan(90-θ)sin^2(θ)+4cosθ/sin(90-θ)-1/tan(90-θ)sin^2(θ)+4cosθ/sin(90-θ)-1/t
sin^2(θ)+4cosθ/sin(90-θ) -1/tan(90-θ)
sin^2(θ)+4cosθ/sin(90-θ) -1/tan(90-θ)
sin^2(θ)+4cosθ/sin(90-θ) -1/tan(90-θ)
[sin^2(θ)+4cosθ]/sin(90-θ)-1/tan(90-θ)
=[sin^2(θ)+4cosθ]/cos(θ)-1/cotθ
=[sin^2(θ)+4cosθ]/cos(θ)-sin(θ)/cosθ
=[sin^2(θ)-sinθ+4cosθ]/cosθ
={sin(θ)[sin(θ)-1]+4cosθ]/cosθ
=tanθ(sinθ-1)+4
sin^2(θ)+4cosθ/sin(90-θ) -1/tan(90-θ)
=sin^2θ+4cosθ/cosθ-1/cotθ
=sin^2θ+4-tanθ
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.
求证:(1+cosθ+cosθ/2) /(sinθ+sinθ/2)=sinθ/1-cosθ
求证(1-sinθcosθ)除以(cos^2θ-sin^2θ)=(cos^2θ-sin^2θ)除以(1+2sinθcosθ)
已知sinΘ+cosΘ=2sinα,sinΘ*cosΘ=sin²β,求证:4cos²2α=cos²2β
已知sinθ+cosθ=2sinα,sinθ*cosθ=sin²β,求证:4cos²2α=cos²2β
化简:1+sinθ+cosθ+2sinθcosθ /1+sinθ+cosθ
sin^2(θ)+4cosθ/sin(90-θ) -1/tan(90-θ)
(cosθ+sinθ)=√2sin(θ+π/4)
1,已知sinθ-cosθ=-1/5求(1)sinθcosθ(2)sin^4θ+cos^4θ2,证明下列恒等式(1)2cos²θ+sin^4θ=cos^θ+1(2)sin^4θ+sin²θcos²θ+cos²θ=1
参数方程化为普通方程 x=(sinθ+cosθ)/(2sinθ+3cosθ) y=sinθ/(2sinθ+3cosθ)
已知sinθ+cosθ=2sinα,sinθcosθ=sin(平方β)求正4cos方2α=cos方2β求详细过程
2sinθ+cosθ/sinθ-3cosθ=-5,求cos2θ+4sinθ
已知tanθ=2,求2sinθ-2cosθ/4sinθ-9cosθ的值!
求值:(tan10°-√3)×cos10°/sin50° 求证:[sin(2α+β)]/sinα- 2cos(α+β)=sinβ/cosα 化简cosθ+cos(θ+2π/3)+cos(θ+4π/3) 证明:sin(α+β)sin(α-β)=sin^2α-sin^2β
已知sinθ+sin^2θ=1,求3cos^2θ+cos^4θ-2sinθ+1
化简【1+sinθ-cosθ/1+sinθ+cosθ】+cot(θ/2)
求值: 2(sin^6 θ+cos^6 θ)-3(sin^4 θ+cos^4 θ)
(1+sinθ+cosθ)/(sin θ/2+cosθ/2)