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Please help me with this questio, I need help with part b Question 4 (16 marks) (a) Show that x cosh(na) dr = sinh(na) cosh

Please help me with this questio, I need help with part b

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Question 4 (16 marks) (a) Show that x cosh(na) dr = "sinh(na) cosh (nx) + C n n2 for n E N. Hint: use integration by parts. (b) Hence or otherwise, use a hyperbolic substitution to evaluate arccosh(Vx2 + 1) dx

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