作业帮y=e_x cos x 求dy
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y=e_x cos x 求dy
y=e_x cos x 求dy
y=e_x cos x 求dy
dy=cosxd(e^x)+e^xdcosx
=e^xcosxdx-e^xsinxdx
=e^x(cosx-sinx)dx
dy=[e^x(-sinx)+e^xcosx]dx=e^x(cosx-sinx)dx
e^x(cosx-sinx)dx
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