Question 10

Section A · 1 mark · 57% correct

The question in our own words · page 6

With \(f(x)=2x^2+x-1\) and \(g(x)=\sin(x)\), both on all real numbers, when is \((f\circ g)(x)>0\)?

  1. A\(\sin(x)\le-1\)
  2. B\(-1<\sin(x)<0\)
  3. C\(\tfrac12<\sin(x)\le1\)
  4. D\(0<\sin(x)<\tfrac12\)
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