Tryg Ssss: Sin4x − cos5x=0

'Leszek: sin(4x) = cos(5x) sin(4x) = sin(5x + π/2) 4x= 5x + π/2 + 2kπ lub 4x = π − (5x+π/2) + 2kπ Czyli x = 5x/4 + (k+1/4)*π/2 lub x = −5x/4 + (4k−1)*π/8 , k ⊂ C