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Date May 2019 Marks available 4 Reference code 19M.2.AHL.TZ1.H_4
Level Additional Higher Level Paper Paper 2 Time zone Time zone 1
Command term Find and State Question number H_4 Adapted from N/A

Question

The function f is defined by  f ( x ) = sec x + 2 , 0 x < π 2 .

Write down the range of f .

[1]
a.

Find f-1(x), stating its domain.

[4]
b.

Markscheme

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

f ( x ) ≥ 3      A1

[1 mark]

a.

x = sec y + 2        (M1)

Note: Exchange of variables can take place at any point.

cos y = 1 x 2        (A1)

f ( x ) = arccos ( 1 x 2 ) , x  ≥ 3      A1A1

Note: Allow follow through from (a) for last A1 mark which is independent of earlier marks in (b).

[4 marks]

b.

Examiners report

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

Syllabus sections

Topic 2—Functions » SL 2.2—Functions, notation domain, range and inverse as reflection
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