Q55. If cos 2 = k, what is the value of cos 1?Mathematics — FAST Mock 3 — Question 55 of 120A. ±√[(1 + k)/2]B. √[(1 + k)/2]C. -√[(1 + k)/2]D. √[(1 - k)/2]Practice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →