题目内容
若cos(
-α)=
,则cos(
+α)=______.
| π |
| 6 |
| ||
| 3 |
| 5π |
| 6 |
∵cos(
-α)=
,
∴cos(
+α)
=cos[π-(
-α)]
=-cos(
-α)
=-
.
故答案为:-
| π |
| 6 |
| ||
| 3 |
∴cos(
| 5π |
| 6 |
=cos[π-(
| π |
| 6 |
=-cos(
| π |
| 6 |
=-
| ||
| 3 |
故答案为:-
| ||
| 3 |
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题目内容
| π |
| 6 |
| ||
| 3 |
| 5π |
| 6 |
| π |
| 6 |
| ||
| 3 |
| 5π |
| 6 |
| π |
| 6 |
| π |
| 6 |
| ||
| 3 |
| ||
| 3 |