sin75度+cos15度=——————————— - 知识问答

sin75度+cos15度=————————————

2个回答

sin75°＋cos15°
=sin75°＋sin75°
=2sin75°
=2sin(45°＋30°)
=2[(√2/2)(√3/2)＋(√2/2)(1/2)]
=(√6＋√2)/2

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