sin(-260°)cos80° |
cos2145°-sin235° |
A.-
| B.-
| C.
| D.
|
sin(-260°)cos80° |
cos2145°-sin235° |
sin80°cos80° |
cos235°-sin235° |
sin160° |
2cos70° |
1 |
2 |
π |
2 |
A.sin(2π+x)=sinx | B.sin(π-x)=-sinx | ||||
C.sin(
| D.cos(π+x)=cosx |
π |
2 |
A.0 | B.-1 | C.2sinα | D.-2sinα |
sin(x-3π)•cos(2π-x)•sin(-x+
| ||
cos(-x-π)•cos(
|
4 |
5 |
π |
2 |
A.-
| B.-
| C.
| D.
|
© 2017-2019 超级试练试题库,All Rights Reserved.