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And from the mapping grid in that report:Many candidates approached this question by integrating the given differential equation
rather than using x = A cos (nt + α). The complex integration and algebra led to few correct
solutions, although some candidates did manage to gain 4 marks. In many of the approaches
taken, the candidates did not check the initial conditions for x and v. Failure to do this
resulted in the loss of one of the available marks.
1 mark for showing n = 2
1 mark for using t = 0, x = 3
1 mark for differentiating to obtain v and using t = 0, v = -6sqrt(3) to obtain correct second equation
1 mark for evaluation of A
1 mark for evaluation of α