The range of the function f(x)

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Question:
The range of the function $f(x)=\sqrt{1-x^{2}}$ is _________ .

Solution:

$f(x)=\sqrt{1-x^{2}}$

Since f(x) ≥ 0 ( Being a square root)

∴ Range of f(x) = [0, ∞)