show that (a) By choosing an appropriate trigonometric substitution and simplifying the result, VI2 + 1 tan ' ( 0 ) sec ( 0 ) do . (b) Evaluate tan'(0) sec(0) do in terms of 0. (c) Express your answer to part (b) in terms of a according to the trigonometric substi tution you applied in part (a). Your final answer may not include any trigonometric functions or inverse trigonometric functions