cosx |
cos(30°-x) |
A.
| B.-
| C.59
| D.-59
|
cosx |
cos(30°-x) |
cox |
cos(30°-x) |
cos(60°-x) |
cos(x-30°) |
cosx+cos(60°-x) |
cos(x-30°) |
2cos(30°)cos(x-30°) |
cos(x-30°) |
3 |
3 |
59 |
2 |
3 |
59
| ||
2 |
A.y=3-x | B.y=x2-1 | C.y=
| D.y=(x-1)2 |
1 |
3 |
1 |
27 |
1 |
x2 |
1 |
x2 |
A.-1 | B.1 | C.0 | D.1000 |
© 2017-2019 超级试练试题库,All Rights Reserved.