题目内容
sin(θ+75°)+cos(θ+45°)-
cos(θ+15°)=______.
| 3 |
sin(θ+75°)+cos(θ+45°)-
cos(θ+15°)
=sin(θ+75°)+cos(θ+15°+30°)-
cos(θ+15°)
=sin(θ+75°)+
cos(θ+15°)-
sin(θ+15°)-
cos(θ+15°)
=sin(θ+75°)-[
sin(θ+15°)+
cos(θ+15°)]
=sin(θ+75°)-sin(θ+75°)=0.
故答案为:0.
| 3 |
=sin(θ+75°)+cos(θ+15°+30°)-
| 3 |
=sin(θ+75°)+
| ||
| 2 |
| 1 |
| 2 |
| 3 |
=sin(θ+75°)-[
| 1 |
| 2 |
| ||
| 2 |
=sin(θ+75°)-sin(θ+75°)=0.
故答案为:0.
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