Date | May 2017 | Marks available | 4 | Reference code | 17M.2.AHL.TZ1.H_4 |
Level | Additional Higher Level | Paper | Paper 2 | Time zone | Time zone 1 |
Command term | Write down | Question number | H_4 | Adapted from | N/A |
Question
The region A is enclosed by the graph of y=2arcsin(x−1)−π4, the y-axis and the line y=π4.
Write down a definite integral to represent the area of A.
Calculate the area of A.
Markscheme
* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.
METHOD 1
2arcsin(x−1)−π4=π4 (M1)
x=1+1√2(=1.707…) (A1)
1+1√2∫0π4−(2arcsin(x−1)−π4)dx M1A1
Note: Award M1 for an attempt to find the difference between two functions, A1 for all correct.
METHOD 2
when x=0, y=−5π4(=−3.93) A1
x=1+sin(4y+π8) M1A1
Note: Award M1 for an attempt to find the inverse function.
∫π4−5π4(1+sin(4y+π8))dy A1
METHOD 3
∫1.38...0(2arcsin(x−1)−π4)dx|+1.71...∫0π4dx−1.71...∫1.38...(2arcsin(x−1)−π4)dx M1A1A1A1
Note: Award M1 for considering the area below the x-axis and above the x-axis and A1 for each correct integral.
[4 marks]
area=3.30 (square units) A2
[2 marks]