y=-sin2xlnx+(cos^2x)/x 导数-(2cos2xlnx+(2sin2x)/x+(cos^2x)/(x^2))
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y=-sin2xlnx+(cos^2x)/x 导数-(2cos2xlnx+(2sin2x)/x+(cos^2x)/(x^2))
y=-sin2xlnx+(cos^2x)/x 导数
-(2cos2xlnx+(2sin2x)/x+(cos^2x)/(x^2))
y=-sin2xlnx+(cos^2x)/x 导数-(2cos2xlnx+(2sin2x)/x+(cos^2x)/(x^2))
知道还问?
用chain rule和(uv)'=u'v+v'u慢慢算就行了