4=16/r

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Solution for 4=16/r equation: 


D( r )

r = 0

r = 0

r = 0

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

4 = 16/r // - 16/r

4-(16/r) = 0

4-16*r^-1 = 0

-16*r^-1 = -4 // : -16

r^-1 = 1/4

-1 < 0

1/(r^1) = 1/4 // * r^1

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

4 = r^1

r = 4

r = 4

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