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[" 53.Let "f" be the function on "[-pi,p...

[" 53.Let "f" be the function on "[-pi,pi]" given by "f(0)=9" and "f(x)=sin((9x)/(2))/sin((x)/(2))" for "x=],[(2)/(pi)int_(-pi)^( pi)f(x)dx" is : "],[[" (a) "2," (b) "4," (c) "6," (d) "8]]

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Let f be the function defined on [-pi,pi] given by f(0)=9 and f(x)=sin((9x)/2)/sin(x/2) for x!=0 . The value of 2/pi int_-pi^pif(x)dx is

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