Q21. If Y = cos-1((1 - lnx) / (1 + lnx)), what is the value of dy/dx at x = e?Mathematics — NUST Mock By IBAGRADS 5 — Question 21 of 200A. -1/eB. -1/(2e)C. 1/(2e)D. 1/ePractice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →