Application of Derivatives

5. Show that the following functions have the functions have neither maximum nor minimum value: (i) x - 9x +94x - 7 (il) 4x - 18r# + 27x - 7. (ul cor=x, tanix (iv) tanx, cotx. 5. Show that for I me (1) xi is a max. * is a min. Log & 6 . (1) Prove that the a seco seco + b cosec 0 is a min. when 8 . Find when is a mar