(1+cos2A)(1+cos2C) |
| ||
2 |
1 |
2 |
2 |
3 |
1 |
2 |
2cos2A•2cos2C |
1 |
2 |
(1+cos2A)(1+cos2C) |
2cos2A•2cos2C |
| ||
2 |
1 |
2 |
| ||
2 |
| ||
2 |
| ||||
4 |
a+
| ||
|
sin450+
| ||
|
| ||||||
2•
|
2 |
3 |
a+
| ||
|
sin750+
| ||
|
2 |
3 |
2 |
3 |
x |
2 |
3 |
x |
2 |
x |
2 |
3 |
| ||
2 |
A.锐角三角形 | B.钝角三角形 | C.直角三角形 | D.无法确定 |
A |
2 |
2
| ||
5 |
AB |
AC |
2sin(A+
| ||||
1-cos2A |
m |
3 |
n |
m |
n |
π |
2 |
3 |
a |
b |
π |
2 |
a |
b |
1 |
2 |
| ||
10 |
π |
2 |
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