please solve question c on page by handwriting

1. (a) Evaluate lim(cos x) . x+0 (b) Let g be a differentiable function satisfying g'(6) = -1. The equation y = g(xy) defines y implicitly as a function of x. Find an expression for y' in terms of x, y and g'. Also find the equation of the tangent line at the point (2, 3) on the curve. (c) Use the linear approximation to estimate (8.1)3. Is the approximation an over-estimate or an underestimate? Justify your