1/A=1/A1+1/A2+1/A3

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Solution for 1/A=1/A1+1/A2+1/A3 equation: 


D( A )

A^1 = 0

A = 0

A^3 = 0

A^2 = 0

A^1 = 0

A^1 = 0

A = 0

A = 0

A = 0

A^3 = 0

A^3 = 0

1*A^3 = 0 // : 1

A^3 = 0

A = 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/A = 1/(A^1)+1/(A^2)+1/(A^3) // - 1/(A^1)+1/(A^2)+1/(A^3)

1/A-(1/(A^1))-(1/(A^2))-(1/(A^3)) = 0

1/A-A^-1-A^-2-A^-3 = 0

-1*A^-2-1*A^-3 = 0

(-1*A^1-1*A^0)/(A^3) = 0 // * A^6

A^3*(-1*A^1-1*A^0) = 0

A^3

-A-1 = 0

-1*A^1 = 1 // : -1

A^1 = -1

A = -1

A in { -1} 

A = -1

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