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f(x)= {((1- cos 4x)/(8x^(2))",",x ne 0),...

`f(x)= {((1- cos 4x)/(8x^(2))",",x ne 0),(k",",x= 0):}`. If the function f(x) is continuous at x= 0, then find k.

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The correct Answer is:
k=1
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