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c1 june 2012 plzzzz help

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Za_shadow:
C1 plzz help june 2012 question 9 e
i don't understand it at all
plzz tell me how did the ms solve it :/

http://www.mediafire.com/?o1n7hoan4pa9m#69s89in22361s

astarmathsandphysics:
try this

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