AB |
AC |
π |
4 |
π |
4 |
AB |
AC |
A.夹角为锐角 | B.夹角为钝角 | C.垂直 | D.共线 |
AB |
AC |
π |
4 |
π |
4 |
sinx |
cosx |
| ||
2 |
sinx |
cosx |
| ||
2 |
| ||
2 |
(sinx+cosx)(sinx-cosx) |
cosx |
| ||
2 |
(cosx-sinx)(sinx+cosx) |
cosx |
| ||
2cosx |
AB |
AC |
π |
2 |
7 |
13 |
tanα |
1+tanα |
A.
| B.
| C.-
| D.-
|
sin(π-α)cos(2π-α)sin(-α+
| ||
tan(-α-π)sin(-π-α) |
1 |
3 |
1 |
5 |
3sinθ-2cosθ |
2sinθ+cosθ |
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