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प्रश्न
Choose the correct alternative:
If 0 ≤ θ ≤ π and the system of equations x + (sin θ)y – (cos θ)z = 0, (cos θ) x – y + z = 0, (sin θ) x + y + z = 0 has a non-trivial solution then θ is
पर्याय
`(2pi)/3`
`(3pi)/4`
`(5pi)/6`
`pi/4`
उत्तर
`pi/4`
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