来自卢朝霞的问题
【已知f(阿尔法)=sin(π/2+α)+3sin(-π-α)/2cos(11π/2-α)-cos(5π-α).(1)化简f(α)(2)已知tanα=3,求f(α)的值】
已知f(阿尔法)=sin(π/2+α)+3sin(-π-α)/2cos(11π/2-α)-cos(5π-α).
(1)化简f(α)(2)已知tanα=3,求f(α)的值
1回答
2020-06-25 00:00