Find the limit of the trigonometric function. (If an answer does not exist, enter DNE.) lim 4 cos x x - 1/2 cot x Submit Answer 18. [-/1 Points] DETAILS LARCALCET6 2.3.077. Find the limit of the trigonometric function. (If an answer does not exist, enter DNE.) lim 3 - 3ex Need Help? Watch It 19. [-/1 Points] DETAILS LARCALCET6 2.3.079. Find the limit of the trigonometric function. (If an answer does not exist, enter DNE.) lim sin 6t -0 5t 20. [-/1 Points] DETAILS LARCALCET6 2.3.081. Use a graphing utility to graph the function and estimate the limit. Use a table to reinforce your conclusion. Then find the limit by analytic methods. (You may round your answer to three decimal places.) lim Vr+8 - V8 Need Help? Watch It 21. [-/1 Points] DETAILS LARCALCET6 2.3.092.MI. Consider the following function. F(x) = 4x2 - 8x Find the limit. lim: S( x + Ax) - f (x) Ar