Question 1

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Considering the function f left parenthesis x right parenthesis equals open curly brackets table row cell 1 space space space space space space space space space open vertical bar x close vertical bar less-than or slanted equal to 9 over 4 end cell row cell 0 space space space space pi greater-than or slanted equal to open vertical bar x close vertical bar greater than 9 over 4 end cell end table close , compute

sum for n greater-than or slanted equal to 1 of sin open parentheses fraction numerator 9 times n over denominator 4 end fraction close parentheses squared over n squared
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