Question

how would you find the range of 1-2cosx?

Answer 1

the range of cosine is \([-1,1]\)
the range of \(-2\cos(x)\) is therefore \([-2,2]\)

Answer 2

that makes the range of \(-2\cos(x)+1\) to be \([-1,3]\)

Answer 3

thank you very much!