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Date November 2020 Marks available 4 Reference code 20N.2.AHL.TZ0.H_3
Level Additional Higher Level Paper Paper 2 Time zone Time zone 0
Command term Find and Hence Question number H_3 Adapted from N/A

Question

The following diagram shows part of the graph of y=p+qsin(rx) . The graph has a local maximum point at -9π4, 5 and a local minimum point at -3π4, -1.

Determine the values of p, q and r.

[4]
a.

Hence find the area of the shaded region.

[4]
b.

Markscheme

* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.

the principal axis is 5+-12=2

so p=2       A1

the amplitude is 5--12=3

so q=3       A1


EITHER

one period is 2-3π4--9π4       (M1)

=3π

2πr=3π


OR

Substituting a point eg -1=2+sin-3π4r

sin-3π4r=-1-3π4r=-5π2, -π2, 3π2,

Choice of correct solution -3π4r=-π2       (M1)


THEN

r=23       A1

y=2+3sin2x3


Note:
q and r can be both given as negatives for full marks


[4 marks]

a.

roots are x=-1.09459, x=-3.617797       (A1)

-3.617797-1.094592+3sin2x3dx       (M1)

=-1.66=-1.66179       (A1)

so area =1.66  units2       A1


[4 marks]

b.

Examiners report

[N/A]
a.
[N/A]
b.

Syllabus sections

Topic 5 —Calculus » SL 5.5—Integration introduction, areas between curve and x axis
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