![if \: ^{n - 1} c_{r} = (k^{2} - 3) \: then \: k \in \: ? \\ a. (-\ \infty, -2] \: \: \: \: \: \: \: \: \: \: b.[2, \infty ) \\ c.[ - \sqrt{3}, \sqrt{3} ] \: \: \: \: \: \: \: \: \: \: \:d.( \sqrt{3} ,2] \: \:](https://tex.z-dn.net/?f=+if+%5C%3A+%5E%7Bn+-+1%7D+c_%7Br%7D++%3D+%28k%5E%7B2%7D++-+3%29+%5C%3A+then+%5C%3A+k+%5Cin+%5C%3A++%3F+%5C%5C+a.+%28-%5C+%5Cinfty%2C+-2%5D++%5C%3A++%5C%3A++%5C%3A++%5C%3A++%5C%3A++%5C%3A++%5C%3A++%5C%3A++%5C%3A++%5C%3A+b.%5B2%2C+%5Cinfty+%29+%5C%5C+c.%5B+-+%5Csqrt%7B3%7D%2C+%5Csqrt%7B3%7D+%5D+%5C%3A++%5C%3A+++%5C%3A++%5C%3A+%5C%3A+++%5C%3A++%5C%3A++%5C%3A++%5C%3A++%5C%3A+%5C%3Ad.%28+%5Csqrt%7B3%7D++%2C2%5D+%5C%3A++%5C%3A+ "if \: ^{n - 1} c_{r} = (k^{2} - 3) \: then \: k \in \: ? \\ a. (-\ \infty, -2] \: \: \: \: \: \: \: \: \: \: b.[2, \infty ) \\ c.[ - \sqrt{3}, \sqrt{3} ] \: \: \: \: \: \: \: \: \: \: \:d.( \sqrt{3} ,2] \: \:")
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