53. Use the Derivative Rule Theorem 3, to derive (d/dx) sec-1 x = 1/| x | sqrt(x^2 - 1) , | x | ＞ 1.

3.9  Inverse Trigonometric Functions Ex53
數學系卡安很閒 所以決定拯救沒辦法用slader和chegg的莘莘學子
53. Use the Derivative Rule in Section 3.8, Theorem 3, to derive
(d/dx) sec-1 x = 1/| x | sqrt(x^2 - 1) , | x | ＞ 1.