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# Urgent help needed!!!!

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1. The answer is a=1.3 or -1.3 and k=pi/6 but I don't understand where these results come from...have no idea at all Urgent help plzzzzz, my core 4 exam is this afternoon
2. a is your maximum hence it is 1.3
3. The other part is to do with maximums on the cos graph so the max can occur at Pi or 2pi or -pi when cos()=1 hence 12k=2pi so k equals pi/6 something like that
4. (Original post by Jackhawkins21)
a is your maximum hence it is 1.3
Yeah the whole trick to this question is that cosx is at a maximum when X = 2npi
5. (Original post by Jackhawkins21)
The other part is to do with maximums on the cos graph so the max can occur at Pi or 2pi or -pi when cos()=1 hence 12k=2pi so k equals pi/6 something like that
Thank you! Got it now

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