8 |
9 |
7 |
6 |
1 |
3 |
| ||
2 |
|
8 |
9 |
|
ab |
2 |
a2+b2-c2 |
2ab |
| ||||
2ab |
5 |
16 |
7 |
6 |
1 |
3 |
|
1 |
12 |
25 |
12 |
a2+b2-c2 |
2ab |
| ||
2ab |
11 |
24 |
π |
2 |
π |
4 |
π |
2 |
a |
b |
a |
b |
a |
b |
π |
8 |
5π |
8 |
π |
8 |
2 |
π |
4 |
A.终边相同的角一定相等 |
B.第一象限的角是锐角 |
C.若α-β=2kπ(k∈z),则角α的三角函数值等于角β的同名三角函数值 |
D.半径为R,n°的圆心角所对的弧长为R•n° |
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