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1) Rút gọn biểu thức sau: a) K = Sin( bi + x ) - cos ( (bi/2) - x ) + tan [ ( (3bi)/2 ) - x ] + cot (2bi - x ) b) L = cot ( x -2bi ) . Cos ( x - (3bi)/2 ) + cos (x + 2bi) - 3sin (x - bi )
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