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Odvození vzorce pro tg(x/2)
Odvoď vzorec pro \large \tg \Large \frac{x}{2}\large .
\large =\Large \frac{\sin x}{1-\cos x}\large
\large =\Large \frac{1-\cos x}{\sin x}\large
\large =\Large \frac{\sin x}{1+\cos x}\large
\large =\Large \frac{1+\cos x}{\sin x}\large