Exercise 1.33: You can obtain an even more
general version of accumulate (Exercise 1.32) by introducing the
notion of a 
filter on the terms to be combined.  That is, combine
only those terms derived from values in the range that satisfy a specified
condition.  The resulting filtered-accumulate abstraction takes the same
arguments as accumulate, together with an additional predicate of one argument
that specifies the filter.  Write filtered-accumulate as a procedure.
Show how to express the following using filtered-accumulate:


 the sum of the squares of the prime numbers in the interval 
  a
 to 
  b

(assuming that you have a prime? predicate already written)

 the product of all the positive integers less than 
  n
 that are relatively
prime to 
  n
 (i.e., all positive integers 
  
    i
    <
    n
  
 such that

  
    GCD
    (
    i
    ,
    n
    )
    =
    1
  
).