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<p>non-linear function will depend on the particular probability distribution of the random variable .</p>

<p><big> Covariance algebra for random variables </big></p>
<p>The covariance () between the random variable  resulting from an algebraic operation and the random variable  can be calculated using the following set of rules:</p>

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*<a href="page.php?w=Addition">Addition</a>:  If  and  are <a href="page.php?w=Independence_%28probability_theory%29">independent</a> from each other, then: <br/>
*<a href="page.php?w=Subtraction">Subtraction</a>:  If</p><p>
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