Question 2 [3] Evaluate the following indefinite integral: sin'(x) cos (x) dx Only show your answer and how you test your answer through differentiation. Answer: Marks Test your answer. Marks Question 3 [4] The decay rate of a radioactive substance, in millirems per year, is given by the function g(t) with t in years, Use definite integrals to represent each of the following. DO NOT CALCULATE THE INTEGRAL(S). 3.1 The quantity of the substance that decays over the first 10 years after the spill. Marks 3.2 The average decay rate over the interval [5, 25]. Marks