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NSWMaths AdvancedQuick questions

Year 12: Calculus

Quick questions on Applications of differentiation: stationary points, inflection, optimisation and related rates

4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is sketching a curve, stage by stage?
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A curve sketch is a procedure, and markers want the features labelled, not a freehand squiggle. Work through it in order for y=x33x2y = x^3 - 3x^2, a typical HSC cubic.
What is first derivative test?
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Check the sign of f(x)f'(x) just before and just after the stationary point.
What is second derivative test?
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Evaluate f(x)f''(x) at the stationary point.
What is not eliminating one variable in optimisation?
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You cannot differentiate a function of two variables in Maths Advanced. Use the constraint to reduce to one.

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