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Lilit [14]
3 years ago
12

Can anyone help me with this question pleaseee

Mathematics
1 answer:
shusha [124]3 years ago
7 0
Sorry wish i was in your class to now what varibles are
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The region in the first quadrant bounded by the x-axis, the line x = ln(π), and the curve y = sin(e^x) is rotated about the x-ax
charle [14.2K]
First, it would be good to know that the area bounded by the curve and the x-axis is convergent to begin with.

\displaystyle\int_{-\infty}^{\ln\pi}\sin(e^x)\,\mathrm dx

Let u=e^x, so that \mathrm dx=\dfrac{\mathrm du}u, and the integral is equivalent to

\displaystyle\int_{u=0}^{u=\pi}\frac{\sin u}u\,\mathrm du

The integrand is continuous everywhere except u=0, but that's okay because we have \lim\limits_{u\to0^+}\frac{\sin u}u=1. This means the integral is convergent - great! (Moreover, there's a special function designed to handle this sort of integral, aptly named the "sine integral function".)

Now, to compute the volume. Via the disk method, we have a volume given by the integral

\displaystyle\pi\int_{-\infty}^{\ln\pi}\sin^2(e^x)\,\mathrm dx

By the same substitution as before, we can write this as

\displaystyle\pi\int_0^\pi\frac{\sin^2u}u\,\mathrm du

The half-angle identity for sine allows us to rewrite as

\displaystyle\pi\int_0^\pi\frac{1-\cos2u}{2u}\,\mathrm du

and replacing v=2u, \dfrac{\mathrm dv}2=\mathrm du, we have

\displaystyle\frac\pi2\int_0^{2\pi}\frac{1-\cos v}v\,\mathrm dv

Like the previous, this require a special function in order to express it in a closed form. You would find that its value is

\dfrac\pi2(\gamma-\mbox{Ci}(2\pi)+\ln(2\pi))

where \gamma is the Euler-Mascheroni constant and \mbox{Ci} denotes the cosine integral function.
5 0
4 years ago
In a building there are 30 cylindrical pillars. The radius of each pillar is 42 m and height is 7 m. Find the total cost of pain
SashulF [63]

Answer:

The total cost of painting the curved surface area of all pillars at the rate of Rs 10 per square meter is Rs.554400.

Step-by-step explanation:

Given : In a building there are 30 cylindrical pillars. The radius of each pillar is 42 m and height is 7 m.

To find : The total cost of painting the curved surface area of all pillars at the rate of Rs 10 per square meter ?

Solution :

Radius of each pillar r= 42 m

Height of each pillar h= 7 m

The curved surface area of each pillar is CSA=2\pi rh

Substitute the value,

CSA=2\times \frac{22}{7}\times 42\times 7

CSA=1848\ m^2

Area of 30 pillars is given by,

A=1848\times 30=55440\ m^2

The curved surface area of all pillars at the rate of Rs.10 per square meter.

The cost painting is C=55440\times 10=Rs.554400

Therefore, the total cost of painting the curved surface area of all pillars at the rate of Rs 10 per square meter is Rs.554400.

3 0
4 years ago
Find all unit vectors that are parallel to the line tangent to the curve y = 2 sin x at the point (π/6, 1). (b) Find the unit ve
liberstina [14]

Answer:

For (a) ±< cos ( π /6) , sin( π /6 ) > = ± < 1 /2 , √ 3 /2 > For (b)=   < √ 3 /2 ,- 1 /2 > For (c) see attachment.

Step-by-step explanation:

y'atx=π/6 is 2cos(π/6)=√3.

This direction θ=ψ is given by tanψ=√3.

Inversely, ψ=tan−1√3 is π/6. For the opposite direction ,

it is π+π/6.

The unit vector in the direction θ=π/6 is

<cos(π/6),sin(π/6)>.

For the opposite direction, it is

<cos(π+π/6),sin(π+π/6)>

=<−cos(π/6),−sin(π/6)> .

For Part (b)

That is, the slope of the tangent line is √3. So

(1,√3)

gives the direction of the line and

(√3,−1)

gives the direction of the perpendicular line.

(Note that (b,−a)⊥(a,b) for any vector.)

For Part C

See the link

5 0
4 years ago
How smart am I from a scale of 1-10?
oee [108]

Answer:

if you are asking us then probably a... hmmm -_- 3 yes
3 out of 10

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Please don't answer, I understand it now.
velikii [3]
Cygxdttdfyvuhjbbkibhiugugyfdtsrdrtffygyvjjbkbhi
4 0
3 years ago
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