Question: 19. Evaluate, Vx2 1 x2 20. Prove that, cosh-1x = In x +Vx2 +x-1 for x >1

19. Evaluate, Vx2 1 x2 20. Prove that, cosh-1x = In x 

19. Evaluate, Vx2 1 x2 20. Prove that, cosh-1x = In x +Vx2 +x-1 for x >1

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