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1988 AMC 12 Question 13

AMC12 · 1988 AMC 12

Question 13

If $\sin x=3\cos x,$ then what is $\sin x\cos x?$
  1. $\frac16$
  2. $\frac15$
  3. $\frac29$
  4. $\frac14$
  5. $\frac3{10}$