(csc A + cot A) (1-cos A) = sin A Buktikan

<p>&nbsp;</p><p><strong>Pembahasan&nbsp;</strong></p><p>(csc A + cot A)(1 - cos A)&nbsp;</p><p>&lt;=&gt; [(1/sin A) &nbsp;+ (cos A/sin A)](1 - cos A)&nbsp;</p><p>&lt;=&gt; [(1+ cos A)/sin A](1 - cos A)&nbsp;</p><p>&lt;=&gt; (1 - cos² A)/sin A</p><p>&lt;=&gt; (1 - (1 - sin² A))/sin A</p><p>&lt;=&gt; (sin² A)/sin A</p><p>&lt;=&gt; sin A &nbsp; &nbsp;——&gt; &nbsp;&nbsp;<strong>terbukti</strong></p>