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S is increasing function or not?

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Consider the following statements. 
S1: f(x) = x5 + 3x - 1 is an increasing function for all values of x. 
S2: f(x) = 1-x3-x9 is decreasing function for all values of x where x 0. 

Which of the above statements are TRUE.

  • A-S1 only
  • B-S2 only
  • C-Both S1 and S2
  • D-Neither S1 nor S2

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