create a function named powerHalf(x, n), where this function is recursive like power(x, n), but it also uses the idea that xn = (x n/2)2 when n is even. Use the global variable countcalls to verify that this version of the power function is more efficient than power(x,n), where n is 0 or a positive integer with the base case that: xn = x * xn-1    use python please

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A:

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