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XxLostboyXx
It would be a cosine function because it does not start at the origin and has the amplitude of 6 so it would be the first option.
carlosego
Remember that for this case what you should do is evaluate the function in two known points and verify that it matches the graph.
 y = 3cos (x) +3.
 For x = 0 we have:
 y = 3cos (0) +3.
 y = 3 + 3
 y = 6
 For x = pi we have:
 y = 3cos (pi) +3.
 y = -3 + 3
 y = 0
 Answer: 
 y = 3cos (x) +3. 
 option 2

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