sin75度+cos15度=————————————
问题描述：
sin75度+cos15度=————————————
答
sin75°＋cos15°
=sin75°＋sin75°
=2sin75°
=2sin(45°＋30°)
=2[(√2/2)(√3/2)＋(√2/2)(1/2)]
=(√6＋√2)/2