Question

find the domain of function f (x)=1/3-2cosx ​

Answer 1

Answer:

hi how are you jsidsoeijdjdjrjrjdjdjd

Answer 2

Answer:

[ 1/5 , 1 ]

Step-by-step explanation:

value of cos x lies between -1 and 1

so

-1 ≤ cos x ≤ 1

-2 ≤ 2cos x ≤ 2     (multiply 2)

2 ≥ -2 cos x ≥ -2

5 ≥ 3 - 2cos x ≥ 1  (add 3)

1/5 ≥ 1/ 3-2cos x ≥ 1 (take reciprocal)

Domain is [ 1/5 , 1 ]