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2、此時即為“arctan”模式，在後面輸入數字，如3，即代表計算“arctan3”。
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3、選二次方程，第3個，按下“EXE”，在摁shift。
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4、輸入三個坐標，先按shift，再按“mode”鍵。
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5、空白處輸入0，即可完成。
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