3. (DOK 3) Given that f (x) = x2 a. Find f'(x) by finding lim / (*+n)-J(x) h =0 h b. Find the slope of the tangent line drawn to the graph of f (x) at x = 2 c. Find the equation of the tangent line drawn to the graph of f(x) at x = -1 d. lim f(x)-f(a) x-0 x -a , where a = -1