问题:
已知sinθ+cosθ=
1
5
,θ∈(0,π).求值:
(1)tanθ;
(2)sinθ-cosθ;
(3)sin 3θ+cos 3θ
已知sinθ+cosθ=
,θ∈(0,π).求值:
(1)tanθ;
(2)sinθ-cosθ;
(3)sin 3θ+cos 3θ
1 |
5 |
(1)tanθ;
(2)sinθ-cosθ;
(3)sin 3θ+cos 3θ
参考答案: