Number of points in -2- 2- where fx-cos-1 cos x- is non-derivable is-

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Number of points in $[- 2 π, 2 π]$ , where $f (x) = | {cos}^{- 1} (cos x) |$ is non-derivable is:

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(x, y)

| y | = sin x, y = {cos}^{- 1} (cos x), - 2 π \leq x \leq 2 π,

\frac{π}{2} + {cos}^{- 1} (cos x) = | tan x |, 0 \leq x \leq 2 π

f (x) = [3 + 4 s i n x]

[π, 2 π]

f (x) = [3 + 4 s i n x]

[π, 2 π]

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