题目内容
化简:cos(
+α)+sin(
+α)=______.
| π |
| 3 |
| π |
| 6 |
原式=sin[
-(
+α)]+sin(
+α)
sin(
-α)+sin(
+α)
=2sin
cosα
=cosα
故答案为cosα
| π |
| 2 |
| π |
| 3 |
| π |
| 6 |
sin(
| π |
| 6 |
| π |
| 6 |
=2sin
| π |
| 6 |
=cosα
故答案为cosα
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题目内容
| π |
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| 6 |
| π |
| 2 |
| π |
| 3 |
| π |
| 6 |
| π |
| 6 |
| π |
| 6 |
| π |
| 6 |