5. Find the equation of the tangent line to the function at the given location. (a) g(x) = (8 - x2) (1+x+x2) at x = -2. (b) h(x) = 4-23 at = = 1. x + 2x2 (c) f(x) = xsecx at T = T. 6. Determine all of the x-values in [0, 2x] where g(x) = sin x + cosa has a horizontal tangent line