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Double verticle lines surrounding an expression means to take the absolute value of the expression.

The absolute value of an expression is the expression if it is positive, and the negative of the expression if it is negative, i.e. the unsigned distance from zero. Analytically, in order to process the expression, the absolute value of an expression is also the square root of the square of the expression.

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โˆ™ 2010-02-11 02:15:38
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Q: What is the thing in trig called that has a letter in the center and double vertical lines on both sides?
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