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Define increasing functions a, B, and y on [-1, I ] by a = Xo.1). P = X10.1). and y = ;(@ + 8). Given fe B[-1. 1 ], show that: (c) f E R, [-1, 1 ] if and only if f is continuous at (). (d) If f E Ry[-1, 1 ], then J_, f da = [, f dB = [_, f dy = f(0)