怎么求导怎么画出图!!!!!
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y= x/(1-x^2)^2
y'
= 1/(1-x^2)^2 + x .[ -2(1-x^2)^(-3) . (-2x) ]
= 1/(1-x^2)^2 + 4x^2/(1-x^2)^3
=( 1-x^2 +4x^2) / (1-x^2)^3
= (1-3x^2)/ (1-x^2)^3
y''
= -6x/ (1-x^2)^3 + (1-3x^2). [ -3(1-x^2)^(-4) . ( -2x) ]
= -6x/ (1-x^2)^3 + 6x(1-3x^2)/ (1-x^2)^4
=6x[ - (1-x^2) +6x ]/ (1-x^2)^4
=6x(x^2+6x-1)/ (1-x^2)^4
y'
= 1/(1-x^2)^2 + x .[ -2(1-x^2)^(-3) . (-2x) ]
= 1/(1-x^2)^2 + 4x^2/(1-x^2)^3
=( 1-x^2 +4x^2) / (1-x^2)^3
= (1-3x^2)/ (1-x^2)^3
y''
= -6x/ (1-x^2)^3 + (1-3x^2). [ -3(1-x^2)^(-4) . ( -2x) ]
= -6x/ (1-x^2)^3 + 6x(1-3x^2)/ (1-x^2)^4
=6x[ - (1-x^2) +6x ]/ (1-x^2)^4
=6x(x^2+6x-1)/ (1-x^2)^4
追问
谢谢我求出来了
你知道怎么画图吗
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