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An extremum of the function f(x)=(2-x)/p...

An extremum of the function `f(x)=(2-x)/picospi(x+3)+1/(pi^2)sinpi(x+3)` where x `in (0,4)` occurs at (a) `x=1` (b) `x=2` (c) `x=3` (d) `x=pi`

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