1.25-1/a^2

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Solution for 1.25-1/a^2 equation: 


D( a )

a^2 = 0

a^2 = 0

a^2 = 0

1*a^2 = 0 // : 1

a^2 = 0

a = 0

a in (-oo:0) U (0:+oo)

1.25-(1/(a^2)) = 0

1.25-a^-2 = 0

-1*a^-2 = -1.25 // : -1

a^-2 = 1.25

-2 < 0

1/(a^2) = 1.25 // * a^2

1 = 1.25*a^2 // : 1.25

0.8 = a^2

a^2 = 0.8 // ^ 1/2

abs(a) = 0.8^(1/2)

a = 0.8^(1/2) or a = -0.8^(1/2)

a in { 0.8^(1/2), -0.8^(1/2) }

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