Application of Derivatives

5. Show that the following functions have the functions have neither maximum nor minimum value: (1) x -9x + 94x - 7 (in) 4x - 18r+ 27x - 7. (ur cot=x, tan "x (iv) tanx, cotx. 5. Show that for I me (1) is a max. (1) is a min. 6 . (1) Prove that the a seco seco + b cosec 0 is a min. when tano 8 . Find when is a mar