exam Maths Puzzle Numerical Ability

Can you help me find a example of when log(A+B) = log(A) + log(B) would be true?

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exam Other Question

5) Find the period of f(x) = 3 - 2cos(3x+pi)

a) 2 pi / 3

b) Pi / 3

c) Pi / 6

d) Pi

e) 2 pi MAYSOMEONE HELP ME WITH THIS PROBLEM??

5(x+y) + 9(x+y)