(a) (i) Use the substitution sin(u) = x + 3 to show that dx 12x + 7 -1 (x+3) V-2x² – 12x+7+c. sin - |-2x² (ii) In part (i), we could have used the substitution cos(u) = x+3 instead, but the form of the antiderivative would be different. Without doing any calculations, explain how this is accounted for in the final result. 1 (b) In a given situation, the rate of change of the variable x is proportional to V16 – t2" (i) Using k as the constant of proportionality, write down a differential equation that describes this situation. (ii) Find the general solution of the differential equation you wrote down in (b)(i). You will need to make use of a (simple!) trigonometric substitution while solving this equation.
(a) (i) Use the substitution sin(u) = x + 3 to show that dx 12x + 7 -1 (x+3) V-2x² – 12x+7+c. sin - |-2x² (ii) In part (i), we could have used the substitution cos(u) = x+3 instead, but the form of the antiderivative would be different. Without doing any calculations, explain how this is accounted for in the final result. 1 (b) In a given situation, the rate of change of the variable x is proportional to V16 – t2" (i) Using k as the constant of proportionality, write down a differential equation that describes this situation. (ii) Find the general solution of the differential equation you wrote down in (b)(i). You will need to make use of a (simple!) trigonometric substitution while solving this equation.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
Related questions
Question
![5
sin(u) = x + 3 to show that
V2
(a) (i) Use the substitution
3
sin-1
2
++3)-
dx =
(x+3)
V-2x2 –
12x +7+ c.
12x + 7
-
(ii) In part (i), we could have used the substitution cos(u) = x+3 instead, but the form
of the antiderivative would be different. Without doing any calculations, explain how
this is accounted for in the final result.
1
(b) In a given situation, the rate of change of the variable x is proportional to
V16 – t²
(i) Using k as the constant of proportionality, write down a differential equation that
describes this situation.
(ii) Find the general solution of the differential equation you wrote down in (b)(i). You
will need to make use of a (simple!) trigonometric substitution while solving this
equation.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fcb3eb6f5-ad7a-4565-9bbe-4e7695b0b0f2%2F8816841a-b837-4a90-94c2-7588aa39bd29%2Friumt7c_processed.png&w=3840&q=75)
Transcribed Image Text:5
sin(u) = x + 3 to show that
V2
(a) (i) Use the substitution
3
sin-1
2
++3)-
dx =
(x+3)
V-2x2 –
12x +7+ c.
12x + 7
-
(ii) In part (i), we could have used the substitution cos(u) = x+3 instead, but the form
of the antiderivative would be different. Without doing any calculations, explain how
this is accounted for in the final result.
1
(b) In a given situation, the rate of change of the variable x is proportional to
V16 – t²
(i) Using k as the constant of proportionality, write down a differential equation that
describes this situation.
(ii) Find the general solution of the differential equation you wrote down in (b)(i). You
will need to make use of a (simple!) trigonometric substitution while solving this
equation.
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