The question in our own words · page 2
Each option is a function on all real numbers. Which one has range \([6,12]\)?
- A\(f(x)=6+3\cos(9x)\)
- B\(f(x)=6+6\cos(3x)\)
- C\(f(x)=9-3\cos(6x)\)
- D\(f(x)=9-6\cos(3x)\)
Source: VCAA 2025 VCE Mathematical Methods Examination 2, Section A, Question 1
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