求mathematica的几道题的解题过程1.作{x=1+cos(t),y=sin(t)}的图形2.arctan[1/(x-1/x)],分别求出函数在x=-1,0,1处的左右极限,并画图求出函数的间断点并说明类型3.求∫〔(X^2+1)^0.5-ln(X+1)+secX^2/(2+lgX^2)]dx4.y=ln(1

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