Evaluate the limit using Squeeze Theorem lim x sin If the limit does not exist enter DNE.The limit cos (a) - 1 lim represents the derivative of some function f(x) at some number a. Find f and a. f ( ac) = a=Consider the following function. f ( 20) = 5x2 + 2x+6 x-1 lax + 4 x>1 Determine a value of a such that the function is differentiable everywhere. Give an exact answer. Otherwise, enter DNE if no such value exists. a =