(a) If F(x) = 10x/(1 + x²), find F '(3) and use it to find an equation of the tangent line to the curve y = 10x/(1+x²) at the point (3, 3). F'(3) = y(x) = (b) Illustrate part (a) by graphing the curve and the tangent line on the same screen. y 10- X -10 -5 5 -10 -5 -10- 10- -10- LQ 5 x 10 10 -5 10- LO сл 5 10 x -10 -5 10- -5 -10- x