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3cos15°+sin15°的值等于.

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

故答案为:
2
3
cos15°+sin15° =2(
3
2
sin15°+
1
2
cos15°)=2(sin15°cos30°+cos15°sin30°)
=2sin(15°+30°)=2sin45°=2×
2
2
=
2

故答案为:
2
3
cos15°+sin15° =2(
3
2
sin15°+
1
2
cos15°)=2(sin15°cos30°+cos15°sin30°)
=2sin(15°+30°)=2sin45°=2×
2
2
=
2

故答案为:
2
3
cos15°+sin15° =2(
3
2
sin15°+
1
2
cos15°)=2(sin15°cos30°+cos15°sin30°)
=2sin(15°+30°)=2sin45°=2×
2
2
=
2

故答案为:
2
3
cos15°+sin15° =2(
3
2
sin15°+
1
2
cos15°)=2(sin15°cos30°+cos15°sin30°)
=2sin(15°+30°)=2sin45°=2×
2
2
=
2

故答案为:
2
3
3
3
3 3 cos15°+sin15° =2(
3
2
sin15°+
1
2
cos15°)=2(sin15°cos30°+cos15°sin30°)
=2sin(15°+30°)=2sin45°=2×
2
2
=
2

故答案为:
2
3
2
3
2
3
3
3
3
3
3 3 2 2 2 sin15°+
1
2
cos15°)=2(sin15°cos30°+cos15°sin30°)
=2sin(15°+30°)=2sin45°=2×
2
2
=
2

故答案为:
2
1
2
1 2 1 1 1 2 2 2 cos15°)=2(sin15°cos30°+cos15°sin30°)
=2sin(15°+30°)=2sin45°=2×
2
2
=
2

故答案为:
2
2
2
2
2
2
2
2
2
2
2 2 2 2 2 =
2

故答案为:
2
2
2
2
2 2 .
故答案为:
2
2
2
2
2 2 .