If the equation (lamda-1)x^2+(lamda+1)x+...

If the equation `(lamda-1)x^2+(lamda+1)x+lamda-1=0` has real roots then `lamda= (sintheta)/(costheta).(cos3theta)/(sin3theta)` for (A) only one value of `theta` (B) for infinitely many values of `theta` (C) for no value of `theta` (D) of only two values of `theta`

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