题目
设0<t<
π |
2 |
提问时间:2020-08-02
答案
∵0<t<
,
∴0<cost<1,
f(t)=
+
=(
+
)•(cost+1-cost)=1+
+
+a≥1+a+2
π |
2 |
∴0<cost<1,
f(t)=
1 |
cost |
a |
1−cost |
1 |
cost |
a |
1−cost |
acost |
1−cost |
1−cost |
cost |
π |
2 |
提问时间:2020-08-02
π |
2 |
1 |
cost |
a |
1−cost |
1 |
cost |
a |
1−cost |
acost |
1−cost |
1−cost |
cost |