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SEAMO 2020 — Paper E — Grade 9–10 Question 10

SEAMO · SEAMO 2020 — Paper E — Grade 9–10

Question 10

Find the minimum of $f(x)=\frac{9x^2\sin^2x+4}{x\sin x}$ for $0\lt x\lt \pi$.
  1. $12$
  2. $16$
  3. $20$
  4. $36$
  5. None of the above