1)[tex]tg \alpha tg \beta + (tg \alpha + tg \beta) ctg (\alpha + \beta)[/tex]
2) tg9гр. - tg 27гр. - tg63гр. + tg81гр.
More Questions From This User See All
1)[tex]tg \alpha tg \beta + (tg \alpha + tg \beta) ctg (\alpha + \beta)[/tex]
2) tg9гр. - tg 27гр. - tg63гр. + tg81гр.
Copyright © 2025 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
1) tgatgb + (tga+tgb)*ctg(a+b)
ctg(a+b) = (1-tgatgb) / tga+tgb
=> tgatgb + (tga+tgb)* (1-tgatgb) / tga+tgb =
= tgatgb + 1 - tgatgb = 1
2ое ещё подумаю