1.

The number of values of θ ∈ (0, π) for which the system of linear equationsx + 3y + 7z = 0-x + 4y + 7z = 0(sin 3θ)x + (cos 2θ)y + 2z = 0has a non-trivial solution, is:

A. Three
B. Two
C. Four
D. One
Answer» C. Four


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