<p>Use de Moivre's theorem to express</p>
<ol class="abc-list"><li><div class="list-item-content"><span class="list-item-text">\(\sin 6\theta\) in terms of \(\sin \theta\) and \(\cos \theta\)</span></div></li><li><div class="list-item-content"><span class="list-item-text">\(\cos 6\theta\) in terms of \(\cos \theta\).</span></div></li></ol>

\(\sin 6\theta\) in terms of \(\sin \theta\) and \(\cos \theta\)

\(\cos 6\theta\) in terms of \(\cos \theta\).

Proving Trigonometric Ratios by Complex Numbers [Out of Syllabus]

Complex Numbers

International Baccalaureate Higher Level Mathematics

Cosine and sine of multiple angle expressed as polynomials of sines and cosines

Cosine and sine of multiple angle expressed as polynomials of sines and cosines