How did we make the transformation?

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SpeNch2021-02-28 13:40:03

Trigonometry

SpeNch, 2021-02-28 13:40:03

I can’t understand how we did the transformation here, what did we get sin (2 * (a / 2))?

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Vovau ᅠ, 2021-02-28
@SpeNch

in general, judging by the universal substitution, it should turn out, tga = 2 * tga/2 / 1 - tg^2 a/2
www.cleverstudents.ru/trigonometry/universal_trigo... <-- on this site you will be shown the output

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