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3cos15°+sin15°的值等于.
题目详情
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▼优质解答
答案和解析
cos15°+sin15° =2(
sin15°+
cos15°)=2(sin15°cos30°+cos15°sin30°)
=2sin(15°+30°)=2sin45°=2×
=
.
故答案为:
.
cos15°+sin15° =2(
sin15°+
cos15°)=2(sin15°cos30°+cos15°sin30°)
=2sin(15°+30°)=2sin45°=2×
=
.
故答案为:
.
cos15°+sin15° =2(
sin15°+
cos15°)=2(sin15°cos30°+cos15°sin30°)
=2sin(15°+30°)=2sin45°=2×
=
.
故答案为:
.
cos15°+sin15° =2(
sin15°+
cos15°)=2(sin15°cos30°+cos15°sin30°)
=2sin(15°+30°)=2sin45°=2×
=
.
故答案为:
.
3 3 3 3 cos15°+sin15° =2(
sin15°+
cos15°)=2(sin15°cos30°+cos15°sin30°)
=2sin(15°+30°)=2sin45°=2×
=
.
故答案为:
.
2
3 3 3 3 2 2 2 sin15°+
cos15°)=2(sin15°cos30°+cos15°sin30°)
=2sin(15°+30°)=2sin45°=2×
=
.
故答案为:
.
1 2 1 1 1 2 2 2 cos15°)=2(sin15°cos30°+cos15°sin30°)
=2sin(15°+30°)=2sin45°=2×
=
.
故答案为:
.
2
2 2 2 2 2 2 2 =
.
故答案为:
.
2 2 2 2 .
故答案为:
.
2 2 2 2 .
=2sin(15°+30°)=2sin45°=2×
故答案为:
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=2sin(15°+30°)=2sin45°=2×
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故答案为:
2 |
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2 |
1 |
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=2sin(15°+30°)=2sin45°=2×
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2 |
故答案为:
2 |
3 |
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2 |
1 |
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=2sin(15°+30°)=2sin45°=2×
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故答案为:
2 |
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2 |
1 |
2 |
=2sin(15°+30°)=2sin45°=2×
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故答案为:
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=2sin(15°+30°)=2sin45°=2×
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故答案为:
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3 |
1 |
2 |
=2sin(15°+30°)=2sin45°=2×
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2 |
2 |
故答案为:
2 |
1 |
2 |
=2sin(15°+30°)=2sin45°=2×
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2 |
故答案为:
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故答案为:
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故答案为:
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