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In a right-angled △ABC\triangle ABC△ABC, ∠ACB=90∘\angle ACB = 90^\circ∠ACB=90∘, EEE and FFF are on ABABAB such that AE=ACAE = ACAE=AC and BF=BCBF = BCBF=BC, find the measure of ∠ECF\angle ECF∠ECF in degrees.
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