If F(x) = 12x/(3 + x2), find F '(3) and use it

Question

 If F(x) = 12x/(3 + x2), find F '(3) and use it to find an equation of the tangent line to the curve y = 12x/(3 + x2)
 at the point (3, 3).

a) F'(3)=

b) y(x)=

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