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Hi, could anyone explain how to find the answer to number 6. 
Thanks!!
http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w13_qp_32.pdf
Thanks!!
http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w13_qp_32.pdf