In Exercises 43–47, you will use the equations in (10) to establish those in (12).
(a) For k = 2, . . . , n − 1, show that (Note: This is best accomplished by means of mathematical induction.)
(b) Assuming the inequalities in (11), use part (a) to show that, for k = 2, . . . , n − 1, tan
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