1.
If the system of equations
x+(2sinα)y+(2cosα)z=0x + (\sqrt{2}\sin\alpha)y + (\sqrt{2}\cos\alpha)z = 0

x+(cosα)y+(sinα)z=0x + (\cos\alpha)y + (\sin\alpha)z = 0

x+(sinα)y(cosα)z=0x + (\sin\alpha)y - (\cos\alpha)z = 0

has a non-trivial solution, then α(0,π2)\alpha \in \left(0, \frac{\pi}{2}\right) is equal to: