> 数学 >
数学cos2x+sin2x=根2sin(2x+π/4) .为什么?
人气:282 ℃ 时间:2019-10-20 19:59:26
解答
cos2x+sin2x=√2(cos2x*√2/2+sin2x*√2)
=√2(cos2xsinπ/4+sin2xcosπ/4)
=√2sin(2x+π/4)
推荐
猜你喜欢
© 2025 79432.Com All Rights Reserved.
电脑版|手机版