Erfana Beevee Binte Hassan Shariff's answer to Ray's Secondary 4 A Maths Singapore question.

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Erfana Beevee Binte Hassan Shariff
Erfana Beevee Binte Hassan Shariff's answer
275 answers (Tutor Details)
1st
Your first line of dy/dx is correct. But you factorised out the exponential wrongly. Due to that, your subsequent 2nd differential became incorrect.