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求y=2xsin(2x+50的导数 觉得答案有不对 呵呵.
人气：225 ℃　时间：2020-04-22 08:45:32
解答
y=2xsin(2x+5)
y'=2x'*sin(2x+5)+2x*[sin(2x+5)]'
=2sin(2x+5)+2xcos(2x+5)*(2x+5)'
=2sin(2x+5)+2xcos(2x+5)*2
=2sin(2x+5)+4xcos(2x+5)
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