Question: i stuck in this question please solve this question (a) Calculate cosh (-2 log(4)) exactly, i.e. without using a calculator. (b) Calculate sin (arctan(4)) exactly,
i stuck in this question please solve this question

(a) Calculate cosh (-2 log(4)) exactly, i.e. without using a calculator. (b) Calculate sin (arctan(4)) exactly, i.e. without using a calculator. (c) Without using a calculator, find all values of coshr, if sinha = -4. (Hint: Use a hyperbolic identity.)
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