(tga+ctga)\ (tga-ctga), если tga = 3\2

Question

(tga+ctga)\ (tga-ctga), если tga = 3\2

Answer 1

Tga=3/2(по условию) => ctga = 1 : 3/2 = 2/3
Тогда:
(tga+ctga)/(tga-ctga)=(3/2+2/3)(3/2-2/3) = ((9+4)/6)/((9-4)/6) =
= 13/6 : 5/6 = 13/5