1-2sin(π-3)cos(π+3) |
A.-sin3-cos3 | B.sin3+cos3 | C.±(sin3+cos3) | D.cos3-sin3 |
1-2sin(π-3)cos(π+3) |
1-2sin3•(-cos3) |
|
A.asinB=bsinA | B.acosB=bsinA |
C.asinA=bsinB | D.asinB=bcosB |
b2+a2-c2 |
2ac |
π |
4 |
1 |
5 |
sin2a-sin2a |
1-cos2a |
1 |
2 |
| ||
2 |
λsin2x(sinx+cosx) |
2cosx |
3π |
8 |
π |
4 |
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