Question

Let f(x) = |sin x| + |cos x|, x ∈ R, then

1) f(x) ∈ [0,2]

2) f(x) ∈ [0,√2]

3) f(x) ∈ [0,1]

4) f(x) ∈ [1,√2]

Please explain your answer.

Answer 1

Answer:

hi your answer is

f<x> £ [ 0, 1 ]

Answer 2

Answer:

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Let f(x) = |sin x| + |cos x|, x ∈ R, then

1) f(x) ∈ [0,2]

2) f(x) ∈ [0,√2]

3) f(x) ∈ [0,1]✅

4) f(x) ∈ [1,√2]