题目内容
化简sin(φ+750)+cos(φ+450)-
cos(φ+150)的值为______.
| 3 |
令φ+150=α,则原式=sin(600+α)+cos(300+α)-
cosα
=
cosα+
sinα+
cosα-
sinα-
cosα=0
故答案为 0.
| 3 |
=
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| 2 |
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| 2 |
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| 3 |
故答案为 0.
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