MATH401 Question 3|- functions and numbers A. Prove that cos-¹(-x) = π cos-¹(x) for any real number x satisfying 0 ≤ x ≤ 1 B. A ramp function is given: 5t-3, t>0 t<0 f(t) = 10, Sketch: (1-2) C. Sketch a graph of step function: 4u (1) - 3u(t + 3) + 2u( t - 2)

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