Q61. The solution of the differential equation sec x dy + sec y dx = 0 isMathematics — NUST Mock 9 — Question 61 of 200A. sin y + sin x = cB. sin y - sin x = cC. cos y + cos x = cD. cos y - cos x = cPractice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →