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    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
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    a is your maximum hence it is 1.3
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    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
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    (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
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    (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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