> 数学 >
sin75度+cos15度=————————————
人气:250 ℃ 时间:2020-05-21 12:47:13
解答
sin75°+cos15°
=sin75°+sin75°
=2sin75°
=2sin(45°+30°)
=2[(√2/2)(√3/2)+(√2/2)(1/2)]
=(√6+√2)/2
推荐
猜你喜欢
© 2026 79432.Com All Rights Reserved.
电脑版|手机版