77 À :: `+`(`/`(1, `*`(`^`(tg, 2), `*`(x))), `/`(`*`(9), `*`(tg, `*`(x))), 8) = 0                                             Á :: [3π/2;5π/2] 

ÐÅØÅÍÈÅ 

 

ÎÒÂÅÒ 

À :: Á ::  

Image