kπ |
2 |
π |
3 |
π |
6 |
π |
2 |
π |
2 |
π |
6 |
π |
3 |
π |
2 |
| ||
3 |
| ||
3 |
1 |
a |
1 |
lnx |
A.sin2A=sin2B+sin2C+2sinBsinCcos(B+C) |
B.sin2B=sin2A+sin2C+2sinAsinCcos(A+C) |
C.sin2C=sin2A+sin2B-2sinAsinBcosC |
D.sin2(A+B)=sin2A+sin2B-2sinBsinCcos(A+B) |
2-x2 |
2 |
1 |
x |
A.0 | B.1 | C.2 | D.3 |
1 |
2 |
π |
2 |
1 |
2-π |
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