The question is:
Check whether the function:
y = [cos(2x)]/x
is a solution of
xy' + y = -2sin(2x)
with the initial condition y(π/4) = 0
Answer:
To check if the function y = [cos(2x)]/x is a solution of the differential equation xy' + y = -2sin(2x), we need to substitute the value of y and the value of the derivative of y on the left hand side of the differential equation and see if we obtain the right hand side of the equation.
Let us do that.
y = [cos(2x)]/x
y' = (-1/x²) [cos(2x)] - (2/x) [sin(2x)]
Now,
xy' + y = x{(-1/x²) [cos(2x)] - (2/x) [sin(2x)]} + ([cos(2x)]/x
= (-1/x)cos(2x) - 2sin(2x) + (1/x)cos(2x)
= -2sin(2x)
Which is the right hand side of the differential equation.
Hence, y is a solution to the differential equation.
It called a (tangent)
Thank you have good day ;)
prime1
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adjective
1.
of first importance; main.
"her prime concern is the well-being of the patient"
Similar:
main
chief
key
primary
central
principal
foremost
first
most important
paramount
major
dominant
supreme
overriding
cardinal
preeminent
ultimate
number-one
fundamental
basic
essential
elemental
vital
Opposite:
secondary
subordinate
2.
of the best possible quality; excellent.
"prime cuts of meat"
Similar:
top-quality
highest quality
top
top-tier
best
first-class
first-rate
high-grade
grade A
superior
supreme
flawless
choice
select
finest
superlative
peak
optimal
model
excellent
marvelous
magnificent
superb
fine
wonderful
exceptional
formidable
top of the range
top of the line
tip-top
A1
stellar
top-notch
Opposite:
inferior
noun
1.
a state or time of greatest strength, vigor, or success in a person's life.
"you're in the prime of life"
Similar:
heyday
best days/years
day
time
prime of one's life
maturity
youth
springtime
salad days
bloom
flowering
full flowering
perfection
peak
pinnacle
height
high point/spot
zenith
ascendancy
2.
CHRISTIAN CHURCH
a service forming part of the Divine Office, traditionally said (or chanted) at the first hour of the day (i.e., 6 a.m.), but now little used.
Answer:
x=-17 and x=-19
Step-by-step explanation:
-17+18=1
-19+18=-1
|-1| =1
36 inches = 1 yard
1 inches = 1/36 inches
so 46 inches = 46 * (1/36) yard
46 inches = 46/36 which is approx. 1.28 yard