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AMO 2024 Secondary 3 (Grade 9) Question 6

AMO · AMO 2024 Secondary 3 (Grade 9)

Question 6

If $\cos x+\cos y=3/2$ and $\sin x-\sin y=2/3$, find $\cos(x+y)$.

Question illustration
  1. $4/9$
  2. $1/2$
  3. $25/72$
  4. $3\sqrt3/2$