Question

Range of f(x) = 1/1-2cosx =​

Answer 1

Answer:

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Answer 2

Answer:

1/1−2cosx

We know that, −1≤cosx≤1

⇒−2≤2cosx≤2

⇒−2≤−2cosx≤2

⇒1−2≤1−2cosx≤2+1

⇒−1≤1−2cosx≤3