化简sin2α+cos2α
人气:475 ℃ 时间:2019-10-08 15:40:30
解答
sin2α+cos2α
=√2(sin2α*√2/2+cos2α*√2/2)
=√2(sin2αcosπ/4+cos2αsinπ/4)
=√2sin(2α+π/4)
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