已知α属于(π/2.π) tanα=-3/4则sin(α+π)=?
问题描述:
已知α属于(π/2.π) tanα=-3/4则sin(α+π)=?
答
α属于(π/2.π) tanα=-3/4,所以,sinα=3/5,则sin(α+π)=sinα=3/5
已知α属于(π/2.π) tanα=-3/4则sin(α+π)=?
α属于(π/2.π) tanα=-3/4,所以,sinα=3/5,则sin(α+π)=sinα=3/5