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1978 AMC 12 Question 15

AMC12 · 1978 AMC 12

Question 15

If $\sin x+\cos x=\frac15$ and $0\le x\lt\pi,$ then $\tan x$ is
  1. $-\frac43$
  2. $-\frac34$
  3. $\frac34$
  4. $\frac43$
  5. not completely determined by the given information