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      <text>13.6 Introduction</text>
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      <text><![CDATA[<h3><span>Integration of Trigonometric Functions</span><br></h3>

<p>Integrals involving trigonometric functions are commonplace in engineering mathematics. This is especially true when modelling waves and alternating current circuits. When the root-mean-square (rms) value of a waveform, or signal is to be calculated, you will often find these results in an integral of the form 
  \[\int\sin^2t \,\mathrm{d}t.\]</p>
<p>In this Section you will learn how such integrals can be evaluated.</p>]]></text>
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