I'm having trouble with question 5 (a) of the HSC 1993 paper:
http://www.boredofstudies.org/courses/maths/3u/1095803290_1993_Mathematics_Extension_1_HSC_BOS.pdf
And am also having trouble with question 5 (a) of the HSC 1999 Paper
http://boardofstudies.nsw.edu.au/hsc_exams/hsc2000exams/hsc00_maths/99MATH34.PDF
http://www.boredofstudies.org/courses/maths/3u/1095803290_1993_Mathematics_Extension_1_HSC_BOS.pdf
And am also having trouble with question 5 (a) of the HSC 1999 Paper
http://boardofstudies.nsw.edu.au/hsc_exams/hsc2000exams/hsc00_maths/99MATH34.PDF
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