2024 THREE(a)

Achievement
Question
Differentiate y=x.sec(6x)y = \sqrt{x}.\sec(6x).

You do not need to simplify your answer.
Official Answer
dydx=12x12sec(6x)+6x12sec(6x)tan(6x)\dfrac{dy}{dx}=\dfrac{1}{2}x^{-\frac{1}{2}}\sec(6x)+6x^{\frac{1}{2}}\sec(6x)\tan(6x)

Or equivalent.
Grading Criteria

Achievement (u)

  • Correct derivative.

Merit (r)

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Excellence T1

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Excellence T2

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Video Explanation
2024 NCEA L3 Calculus Exam Walkthrough by infinityplusone(starts at 42:00)
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