已知f(α)=sin(π-α)cos(2π-α)tan(-α-π)tan(-π+
题型:解答题
问题:
已知f(α)=sin(π-α)cos(2π-α)tan(-α-π)tan(-π+α)sin(-α-π) (1)化简f(α); (2)若α是第三象限角,且cos(α-
(3)若α=-1860°,求f(α)的值. |
已知f(α)=sin(π-α)cos(2π-α)tan(-α-π)tan(-π+α)sin(-α-π) (1)化简f(α); (2)若α是第三象限角,且cos(α-
(3)若α=-1860°,求f(α)的值. |