Technical information
Behaviour being used: Adaptive mode
Minimum fraction: 0
Question summary: Dacă u ∈ ( ( ( - ( π ) ) / ( 2 ) ) , ( ( π ) / ( 2 ) ) ) și cos(u) = 2^(1/2)/4+6^(1/2)/4, atunci cos(2u) = ... .
Right answer summary: The content can not be displayed.
Question state: todo