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If x is between -6 and 6?
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linghanyuan(½ð±Ò+1,VIP+0):²¹ÉÏ 7-18 17:55
An alternative is directly using the equation, i.e., if -6 <= x <= 6.
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When x is valued from -6 to +6, .................
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X is true when valued from -6 to +6.
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