What is the derivative of 1 / [(X-2) ^ 2 * (3x + 1) ^ 2]? What about the derivative of 1 / (X-2) ^ 2?

{ 1/[(x-2)^2*(3x+1)^2] }‘
={ 1/[(x-2)(3x+1)] ^2 }‘
=-2 / [(x-2)(3x+1)] ^3 *[(x-2)(3x+1)] '
=-2 / [(x-2)(3x+1)] ^3 * (3x^2-5x-2)‘
=-2 / [(x-2)(3x+1)] ^3 * (6x-5)
= -2 (6x-5)/ [(x-2)^3 (3x+1)^3 ]
{ 1/（x-2）^2 }'
=-2 * 1/（x-2)^3 * （x-2）'
=-2/(x-2)^3

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