4/r=2

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Solution for 4/r=2 equation: 


D( r )

r = 0

r = 0

r = 0

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

4/r = 2 // - 2

4/r-2 = 0

4*r^-1 = 2 // : 4

r^-1 = 1/2

-1 < 0

1/(r^1) = 1/2 // * r^1

1 = 1/2*r^1 // : 1/2

2 = r^1

r = 2

r = 2

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