a)
\(\eqalign{
& f'\left( x \right) = 6\left( {{x^8} - {x^5} + {x^2} - x + 1} \right) \cr
& = 6{x^2}\left( {{x^6} - {x^3} + {1 \over 4}} \right) + 3{x^2} + 6\left( {{{{x^2}} \over 4} - x + 1} \right) \cr
& = 6{x^2}{\left( {{x^3} - {1 \over 2}} \right)^2} + 3{x^2} + 6{\left( {{x \over 2} - 1} \right)^2} > 0,\forall x \in R. \cr} \)
b) \(f'\left( x \right) = 2 + \cos x > 0,\forall x \in R.\)
