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The number of possible value of theta li...

The number of possible value of `theta` lies in `(0,pi)`, such that system of equation `x+3y+7z=0, -x+4y+7z=0, xsin3theta+ycos2theta+2z=0` has non trivial solution is/are equal to (a) 2 (b) 3 (c) 5 (d) 4

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