5. Let f(x) = |cosx),x € (0,21). Determine that where the function S is differentiable, and where it is not differentiable in the interval (0,2n). Also, find the derivative at the points of differentiability.

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5. Let f(x) = [cosx], x E (0,2n). Determine that where the function f is differentiable, and where it
is not differentiable in the interval (0,27). Also, find the derivative at the points of
differentiability.
Let f be a function defined on the real line R and suppose that it satisfies the condition
If(x) – f)I< (x – y)?
for all x, y e R.
Prove that f is a constant function.
Transcribed Image Text:5. Let f(x) = [cosx], x E (0,2n). Determine that where the function f is differentiable, and where it is not differentiable in the interval (0,27). Also, find the derivative at the points of differentiability. Let f be a function defined on the real line R and suppose that it satisfies the condition If(x) – f)I< (x – y)? for all x, y e R. Prove that f is a constant function.
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