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<p>* In <a href="page.php?w=probability_theory">probability theory</a>,   is the <a href="page.php?w=probability_density_function">probability density function</a> of the <a href="page.php?w=standard_normal_distribution">standard normal distribution</a>.<br/>
* In <a href="page.php?w=probability_theory">probability theory</a>, 1=''?''<sub>''X''</sub>(''t'') = E[''e''<sup>''itX''</sup>] is the <a href="page.php?w=characteristic_function_%28probability_theory%29">characteristic function</a> of a random variable X.<br/>
* An <a href="page.php?w=angle">angle</a>,</p><p>
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