Let $z=\cos\!\left(\frac{2\pi}{7}\right)+i\sin\!\left(\frac{2\pi}{7}\right)$. Then the principal argument of $\overline{(1-z^{2}})$ is equal to

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The system of linear equations  has

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The set of all $\lambda\in R$ such that {an} where $a_n=\sqrt{\lambda^2n^2+n+1}-n, n\in N$, is

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The complex number  is the root of the quadratic equation with real coefficients

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The locus of the point (α, β) such that the line y = αx + β, become a tangent to the hyperbola  9x2…

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