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[f(x)=cos(x)s+cos(pi x)" ,where "(y]" is...

[f(x)=cos(x)s+cos(pi x)" ,where "(y]" is the gratest integer function of "y" then "f((pi)/(2))" is equal to "],[[" (a) "cos3," (b) "0," (c) "cos4," (d) None of these "]]

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