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      <text>4.1.1.5</text>
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      <text><![CDATA[<p>Values of \(\sin\theta,\, \cos\theta\) and \(\tan\theta\) can of course be obtained by calculator.  When entering the angle in degrees ( e.g. \(30^\circ\)) the calculator must be in degree mode.  (Typically this is ensured by pressing the DRG  button until 'DEG' is shown on the display).  The keystrokes for \(\sin 30^\circ\) are usually simply \(\fbox{sin} \quad \fbox{30}\) or, on some calculators, \(\fbox{30} \quad \fbox{sin}\) perhaps followed by \(\fbox{=}.\)</p>]]></text>
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