Two of the more highly debated issues in life‐span development psychology today are continuity versus discontinuity and nature versus nurture. At the heart of the continuity versus discontinuity debate lies the question of whether development is solely and evenly continuous, or whether it is marked by age‐specific periods.

Solution: Let us considered y = Now taking log on both sides, we get log y = log y = (log (x – 1) (x – 2) (x – 3) (x – 4) (x – 5)) log y = (log (x – 1) + log (x – 2) – log (x – 3) – log (x – 4) – log (x – 5)) Now, on differentiating w.r.t x, we get Question 3. (log x) cos x Solution: Let us considered y = (log x) cos x