Use the function f and the given real number a to find (F) '(a). (Hint: See Example 5. If an answer does not exist, enter DNE.) f(x) = x3 + 3x - 1, a=-5 ( F - 1 ) ' ( - 5 ) =Use the function f and the given real number a to find (f ")'(a). (Hint: See Example 5. If an answer does not exist, enter DNE.) f(x) = cos(8x), Oxen/8, a = 1 (F] )' (1) =Use the function f and the given real number a to find (f)'(a). (Hint: See Example 5. If an answer does not exist, enter DNE. ) f( x) = x+ 3 x >-1, a = 2 x + 1 (F - 1) ' (a ) =