cos2x+sin2x=________(请说明理由!)

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/30 10:24:30
cos2x+sin2x=________(请说明理由!)
x)K/6.3{:^bg3Oh{>e=6IEX%p/!Bm&0Q,# opJ4Ԁ%M E@$E@ Q<;3Bv

cos2x+sin2x=________(请说明理由!)
cos2x+sin2x=________
(请说明理由!)

cos2x+sin2x=________(请说明理由!)
sin2x+cos2x
=√2(√2/2*sin2x+√2/2cos2x)
=√2(sin2xcosπ/4+cos2xsinπ/4)
=√2sin(2x+π/4)