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$[10$ pts$]f(x)=x-sinx,0x4$

a$)[5$pts$]$ Find ${}^{\text{'}}(x).$ Construct a sign chart for ${}^{\text{'}}(x)$ and use it to answer the following:

$(x)$

$f$ is decreasing on $f$ is increasing on: $f$ haratocat maximum value of $111$ f has a local minimum value of $$ at $x$

The Critical Point$($s$)$ are at $x=$

b$)[5$pts$]$ Find $f^{\text{'}\text{'}}(x).$ Construct a sign chart for $f^{\text{'}\text{'}}(x)$ and use it to answer the following:

$q,$

$f$ is concave up on:

$f$ is concave down on: $$

The Inflection Point$($s$)$ are at $x=,$