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$\cosh (\log 4) = $

यदि $\sqrt{-5-12 i}+\sqrt{7+24 i}$ का मान एक ऋणात्मक वास्तविक संख्या $k$ है,तो $k=$

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$\sinh^{-1}(-2) + \operatorname{cosech}^{-1}(-2) + \coth^{-1}(-2) = $

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