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      <text>10.3.2.1 The exponential form</text>
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      <text><![CDATA[<h3>The exponential form</h3>
<p>Since <span class="math inline">\(z=r(\cos\theta +i\sin\theta )\)</span> and since <span class="math inline">\(e^{i\theta}=\cos\theta
+i\sin\theta\)</span> we therefore obtain another way in which to denote a complex number: <span class="math inline">\(z=re^{i\theta}\)</span>, called the <strong>exponential form</strong>.</p><p><br></p>
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<h4><span style="font-family: inherit;">Key Point</span><br></h4>
<p>The exponential form of a complex number is \[z = re^{i\theta}\quad\text{in which}\quad r=|z|\quad\text{and}\quad\theta=\text{arg}(z)\] so \[z=re^{i\theta}=r(\cos\theta + i\sin\theta)\]</p>
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