(a-3)(a-3)/(3-a)(3+a)

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Solution for (a-3)(a-3)/(3-a)(3+a) equation: 


D( a )

3-a = 0

3-a = 0

3-a = 0

3-a = 0 // - 3

-a = -3 // * -1

a = 3

a in (-oo:3) U (3:+oo)

(((a-3)*(a-3))/(3-a))*(a+3) = 0

((a-3)^2*(a+3))/(3-a) = 0

( a+3 )

a+3 = 0 // - 3

a = -3

( a-3 )

a-3 = 0 // + 3

a = 3

a in { 3} 

a = -3

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