Let f(x) = 15 – |x – 10|; x ∈ R. Then the set of all values of x, at which the function, g(x) = f(f(x)) is not differentiable, is:

Let f(x) = 15 – |x – 10|; x ∈ R. Then the set of all values of x

1.	Let f(x) = 15 – \|x – 10\|; x ∈ R. Then the set of all values of x, at which the function, g(x) = f(f(x)) is not differentiable, is:
A.	{5, 10, 15}
B.	{10, 15}
C.	{5, 10, 15, 20}
D.	{10}
Answer» B. {10, 15}

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Let f(x) = 15 – |x – 10|; x ∈ R. Then the set of all values of x, at which the function, g(x) = f(f(x)) is not differentiable, is:

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