s |
i |
n |
( |
2 |
3 |
2 |
2 |
2 |
(Ⅰ)若 cos(α−
)= π3 2
,求f(α)的值.1 5
(Ⅱ)若 sin(α−π
)=−6
,求 f(α+1 5 π
) 的值.
3