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The function (sin(x+a))/(sin(x+b)) has ...

The function `(sin(x+a))/(sin(x+b))` has no maxima or minima if (a) `b-a=npi,n in I` (b) `b-a=(2n+1)pi,n in I` (c) `b-a=2npi,n in I` (d) none of these

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