3. (a) Calculate sinh (log(5) - log(4)) exactly, i.e. without using a calculator. (3 marks) (b) Calculate sin(arccos )) exactly, i.e. without using a calculator. V65 (3 marks) (e) Using the hyperbolic identity Coshºp - sinh?t=1, and without using a calculator, find all values of cosh r, if tanh x = (4 marks)