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sin 2x+cos 2x=根号2sin (2x+π/4)怎么得出来的,
人气:347 ℃ 时间:2019-10-29 10:39:58
解答
sin 2x+cos 2x
=√2 (sin 2x *√2/2+cos 2x *√2/2)
=√2 (sin 2x *cosπ/4+cos 2x *sinπ/4)
=√2sin (2x+π/4)
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