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If the functions f(x) , defined below is...

If the functions `f(x)` , defined below is continuous at `x=0` , find the value of `k :` `f(x)={(1-cos2x)/(2x^2)\ \ \ ,\ \ \ x<0\ \ \ \ \ k,\ \ \ x=0,x/(|x|)\ \ \ ,\ \ \ x >0`

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