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sin15°cos30°sin75°的值等于3838.

题目详情
sin15°cos30°sin75°的值等于
3
8
3
8
3
8
3
8
3
8
3
3
3
3
388
3
8
3
8
3
8
3
3
3
3
388
▼优质解答
答案和解析
sin15°cos30°sin75°=
23sin15°cos15°cos30°sin75°
23cos15°
=
22sin30°cos30°sin75°
23cos15°
=
21sin60°sin75°
23cos15°
=
3
8

故答案为:
3
8
23sin15°cos15°cos30°sin75°
23cos15°
23sin15°cos15°cos30°sin75°23sin15°cos15°cos30°sin75°23sin15°cos15°cos30°sin75°3sin15°cos15°cos30°sin75°23cos15°23cos15°23cos15°3cos15°=
22sin30°cos30°sin75°
23cos15°
=
21sin60°sin75°
23cos15°
=
3
8

故答案为:
3
8
22sin30°cos30°sin75°
23cos15°
22sin30°cos30°sin75°22sin30°cos30°sin75°22sin30°cos30°sin75°2sin30°cos30°sin75°23cos15°23cos15°23cos15°3cos15°=
21sin60°sin75°
23cos15°
=
3
8

故答案为:
3
8
21sin60°sin75°
23cos15°
21sin60°sin75°21sin60°sin75°21sin60°sin75°1sin60°sin75°23cos15°23cos15°23cos15°3cos15°=
3
8

故答案为:
3
8
3
8
3
3
3
3
33888,
故答案为:
3
8
3
8
3
3
3
3
33888.