If the system of equations x + (\cos \alpha) y + (\sin \alpha) z = 0, x + (\sin \alpha) y − (\cos \alpha) z = 0 has a non-trivial solution, then in the interval is equal to:
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If the system of equations x + (\cos \alpha) y + (\sin \alpha) z = 0, x + (\sin \alpha) y − (\cos \alpha) z = 0 has a non-trivial solution, then in the interval is equal to:
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