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      <text>4.3.1.1 Introduction</text>
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      <text><![CDATA[<h4> Trigonometric identities </h4>
<p>An identity is a relation which is always true. To emphasise this the symbol ‘<span class="math inline">\(\equiv\)</span>’ is often used rather than ‘<span class="math inline">\(=\)</span>’. For example, <span class="math inline">\((x+1)^2\equiv x^2+2x+1\)</span> (always true) but <span class="math inline">\((x+1)^2=0\)</span> (only true for <span class="math inline">\(x=-1\)</span>).</p>]]></text>
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