int) Approximate cos(4.6) using a quadratic approximation: First note that cos(4.6) cos(3x/2). Let f(x) = cos(x). Then, f'(x) = -sinx and f" (x) = COSX Let a = 3/2. Then f' (3/2) = = -sin(3pi/2) and f" (31/2) = -cos(3pi/2) Q(x), the quadratic approximation to cos(x) at a = 3π/2 is: Q(x) = Use Q(x) to approximate cos(4.6). cos(4.6)≈ K last 2

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