cos2x+sin2x=________(请说明理由!)

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cos2x+sin2x=________(请说明理由!)cos2x+sin2x=________(请说明理由!)cos2x+sin2x=________(请说明理由!)sin2x+cos2x=√2(√

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)