4/2=32/r

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Solution for 4/2=32/r equation: 


D( r )

r = 0

r = 0

r = 0

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

4/2 = 32/r // - 32/r

4/2-(32/r) = 0

4/2-32*r^-1 = 0

-32*r^-1 = -2 // : -32

r^-1 = 1/16

-1 < 0

1/(r^1) = 1/16 // * r^1

1 = 1/16*r^1 // : 1/16

16 = r^1

r = 16

r = 16

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