已知cos=3/5,α∈(-π/2,0)求sin(α-π/6)
人气:430 ℃ 时间:2020-04-11 07:14:51
解答
∵ cosα=3/5
∴ sin²α=1-cos²α=1-9/25=16/25
又 α∈(-π/2,0)
∴ sinα
推荐
- 已知sin(α-π/6)=4/5,0≤α≤2π/3,求sin(5π/6-α)+cos(5π/6-α)
- 已知cos(θ-π/6)=3/5,θ∈(π/6,2π/3),求sinθ
- 已知cos(π/6-α)=√3/3,求cos[(5π/6)+α]-sin^2(α-π/6)
- 已知cos(π/6—α)=1/3.则cos(5/6π+α)· sin(2/3π-α)=?
- 已知cos(π/6-α)=√3/3 求cos[(5π/6)+α]-sin^2(α-π/6)的值
- 在直角梯形ABCD中,AB⊥BC,AD∥BC.BC>AD,AD=2,AB=4,E点在AB上,将△CBE沿CE翻折,使得B与D重合.
- 25乘25乘3点14等于几
- The acting is so convincing that...里so ...that 引导什么从句
猜你喜欢