Ответы и объяснения

  • liss
  • отличник
2013-02-27T20:56:29+04:00

sin a = 1/4
sin^2 a = 1/16
cos^2 a = 1 - 1/16 = 15/16
ctg^2 a = 15
ctg a = -√15

2013-02-27T20:57:27+04:00

sin a = 1/4
sin^2 a = 1/16
cos^2 a = 1 - 1/16 = 15/16
ctg^2 a = 15
ctg a = -√15