求大神详细解答这两道高等数学题。跪谢
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5. y = arctan(1/x) + (1/2)xlnx,
y' = (-1/x^2)/(1+1/x^2) + (1/2)lnx + 1/2
= -1/(1+x^2) + (1/2)lnx + 1/2
y'' = 2x/(1+x^2)^2 +1/(2x)
6. y = (x/2)(sinlnx-coslnx)
y' = (1/2)(sinlnx-coslnx) +(1/2)(coslnx+sinlnx) = sinlnx
y'' = coslnx/x, y''(1) = 1
y' = (-1/x^2)/(1+1/x^2) + (1/2)lnx + 1/2
= -1/(1+x^2) + (1/2)lnx + 1/2
y'' = 2x/(1+x^2)^2 +1/(2x)
6. y = (x/2)(sinlnx-coslnx)
y' = (1/2)(sinlnx-coslnx) +(1/2)(coslnx+sinlnx) = sinlnx
y'' = coslnx/x, y''(1) = 1
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