Дано: sina = √2/2 Найти: cosa - ?, tnga - ?, ctnga - ?

Для sina = √2/2:

1. cosa = √(1 - sina^2) = √(1 - (√2/2)^2) = √(1 - 1/2) = √(1/2) = √2/2
2. tnga = sina/cosa = (√2/2) / (√2/2) = 1
3. ctnga = 1/tnga = 1/1 = 1