2022 TWO(a)

Achievement
Question
Differentiate f(x)=(5x3)sin(4x)f(x) = (5x - 3)\sin(4x).

*You do not need to simplify your answer.*
Official Answer
f(x)=4(5x3)cos4x+5sin4xf'(x)=4(5x-3)\cos 4x+5\sin 4x
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
2022 NCEA L3 Calculus Exam Walkthrough by infinityplusone(starts at 29:06)
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