2020 THREE(a)

Achievement
Question
Differentiate y=3ln(x21)y = 3\ln (x^2 - 1).

*You do not need to simplify your answer.*
Official Answer
dydx=3×1x21×2x\dfrac{dy}{dx}=3\times\dfrac{1}{x^2-1}\times 2x
=6xx21=\dfrac{6x}{x^2-1}
Grading Criteria

Achievement (u)

  • Correct derivative.

Merit (r)

-

Excellence T1

-

Excellence T2

-
Video Explanation
NCEA Level 3 Calculus Differentiation 2020 NZQA Exam - Worked Answers by infinityplusone(starts at 41:38)
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