Year 12s: what will be the first way you research your future options? >>

Urgent help needed!!!!

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 :frown:

Urgent help plzzzzz, my core 4 exam is this afternoon :frown:

Reply 1

Jackhawkins21

a is your maximum hence it is 1.3

Reply 2

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

Reply 3

Wahrheit

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

Reply 4

Oliviazh

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