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Sagot :

Step-by-step explanation:

step 1. sinbt cycles twice a day throughout 2pi where t is 0 to 24 hours so b = pi/6

step 2. tide varies between 24m and 12m thus having a medium of (24 + 12)/2 = 18m and a magnitude of 6m

step 3. d = 18m and a = 6m.

step 4. looks like the first option.