Consider the function defined by

where and are real numbers.

1. Given that    and    are continuous over  , show that    and  .  (2 marks)
   

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2. Find the area enclosed by the graph of the function, the x-axis and the lines    and  .  (3 marks)
   

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If  ,    and  , the    equals

A.  

B.  

C.  

D.  

E.