47. Between what values of x is cos x a increasing function? A. Between x = (2n-1) and 1n, where n is any integer. B. Between x = 2n" and 2n, where n is any integer. C. Between x = (2n" and 2n-1"), where n is any integer. D. Between x=(2n-1) and 2n", where n is any integer.