Consider the following function.

$y=5x-2tan(x),(-\frac{}{2},\frac{}{2})$

Find the first and second derivatives.

$y^{\text{'}}(x)=$

$y^{\text{'}\text{'}}(x)=$

Find any values of $c$ such.that $y^{\text{'}\text{'}}(c)=0.($Enter your answer as a comma$-$separated list. If any answer does not exist, enter DNE.$)$

$c=$

Determine the open intervals on which the graph of the function is concave upward or concave downward. $($Enter your answers using interval notation. If an answer does not exist, enter DNE.$)$

concave upward

concave downward $$