求值: 2(sin^6 θ+cos^6 θ)-3(sin^4 θ+cos^4 θ)
已知(4sinθ-2cosθ)/(3sinθ+5cosθ)=6/11,求5cos^2θ/(sin^2θ+2sinθcos
已知sinθ+2cosθsinθ−cosθ=3,求值:
若sinθ+sin^2θ=1,则cos^2θ+cos^4θ+cos^6θ
(1-sin^6θ-cos^6θ)/(1-sin^4θ-cos^4θ)
2sinθ+cosθ/sinθ-3cosθ=-5,求cos2θ+4sinθ
已知 sin(θ+kπ)=-2cos (θ+kπ) 求 ⑴4sinθ-2cosθ/5cosθ+3sinθ; ⑵(1/4)
求值:1-sin^6a-cos^6a/1-sin^4a-cos^4a
化简:1+sinθ+cosθ+2sinθcosθ /1+sinθ+cosθ
已知tanθ=2,求值sin^2θ+sinθcosθ-2cos^2θ
cos^4θ-sin^4θ化简
高一三角函数 快!已知sin^3θ+cos^3θ=1,求sinθ+cosθ及sin^4θ+cos^4θ的值
1.已知tan2分之α=2,求值:⑴ tan(α+4分之π);⑵ (6sinα+cosα)/(3sinα-2cosα)