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| rev | Bot | (Created page with "<div class="d-none"><math> \newcommand{\mathds}{\mathbb}</math></div>Work out the trigonometry formulae <math display="block"> \sin(2t)=2\sin t\cos t\quad,\quad \cos(2t)=2\cos^2t-1 </math> by using elementary methods, coming from plane geometry.") | Apr 20'25 at 1:29 | +248 |