L=(lim)(x->a)(|2sinx-1|)/(2sinx-1)dot...

`L=(lim)_(x->a)(|2sinx-1|)/(2sinx-1)dotT h e n` limit does not exist when (a) `a=pi/6` (b) `L=-1 when a=pi` (c) `L=1 when a=pi/2` (d) `L=1 when a=0`

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