3=12/r

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Solution for 3=12/r equation:


D( r )

r = 0

r = 0

r = 0

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

3 = 12/r // - 12/r

3-(12/r) = 0

3-12*r^-1 = 0

-12*r^-1 = -3 // : -12

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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