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Passage question: Let f(x) = lim n tends to infinity 1-3sin^2n(x)/ 1+sin^2n(x) the value of summation(n=0 to n=2015) f(n pi/2) The number of solutions of the equation f(x)= 1-(4x/pi)

Passage question:

Let f(x) = lim n tends to infinity    1-3sin^2n(x)/                                                          1+sin^2n(x)
 
  1. the value of  summation(n=0 to n=2015) f(n pi/2)
     
  2. The number of solutions of the equation f(x)= 1-(4x/pi)

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