Докажите тождество
[tex] \frac{tga}{1-tg^2a} * \frac{ctg^2a-1}{ctga} =1[/tex]
[tex] \frac{tga}{1-tg^2a} * \frac{ctg^2a-1}{ctga} =1[/tex]
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Answers & Comments
(1/tg²a-1):1/tga=(1-tg²a)/tg²a *tga=(1-tg²a)/tga=2/tg2a
1/2*tg2a*2/tg2a=1