Question 760385
Let y = 1/(secx - 1) - 1/(secx - 1) which after cross muliplying becomes
(2) y = [(secx - 1) - (secx + 1)]/[(secx + 1)*(secx - 1)] or
(3) y = [-2]/[secx^2 - 1] or using the identity
(4) tanx^2 = secx^2 - 1 we have
(5) y = -2/tanx^2 or
(6) y = -2cotx^2