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Math Problem

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I need help on a past year question on Paper 3 Pure Maths - M/J/07.

I don't know how to "show" as the answer on part 7(ii). :oops:

P.S when answering, it would be better for them to be handwritten or in pic. Rather than with ASCII texts. I find them easier to read and understand/
 

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thanks for answering :)

but I'm having doubts on this part.

When its (+)....how come it turned into (-)? Is it because of log-law?
 

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