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[" 30.If "f(x)=sin[pi^(2)]x+sin[-pi^(2)]...

[" 30.If "f(x)=sin[pi^(2)]x+sin[-pi^(2)]x," where "[x]" denotes the greatest integer less than or equal to "],[x" ,then "],[[" (a) "f(pi/2)=1," (b) "f(pi)=2," (c) "f(pi/4)=-1," (d) none of these "]]

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