Q292 · Practice questionTechnology-freeComplex familiar5 marks
QUESTION 292 (5 marks)
A light sculpture has vertical profile for .
a)[1 mark]
Determine where the profile crosses the -axis.
b)[4 marks]
Determine the exact area between the profile and the -axis.
WORKED SOLUTION
5 marksPractice marking scheme
ANSWER
a) and . b) square units.
Worked solution
a) gives the two stated values.
b) Split at both roots. With , the central positive integral is and the total signed integral is . Hence the area is twice the positive integral minus the signed integral: .
Exact answers unless rounding is specified; equivalent forms accepted.
a) Gives both crossings.
b) Splits the integral with the correct signs.
b) Gives the antiderivative.
b) Evaluates the contributions.
b) Gives the exact total area.
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