1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Nuetrik [128]
3 years ago
14

What is the integral of sec (3x) tan (3x) dx?

Mathematics
2 answers:
bekas [8.4K]3 years ago
5 0
∫tan^3(x)*sec^3(x) dx 

<span>=∫tan^2(x)*sec^2(x)*(tanx*secx) dx </span>

<span>=∫(sec^2(x) - 1)*sec^2(x)*(tanx*secx) dx </span>

<span>=∫(sec^4(x) - sec^2(x))*(tanx*secx) dx </span>

<span>=∫(sec^4(x)*(tanx*secx) dx - ∫sec^2(x))*(tanx*secx) dx </span>

<span>=∫(sec^4(x)*d(secx) - ∫sec^2(x))d(secx) </span>

<span>=(1/5)sec^5(x) - (1/3)sec^3(x) + c
hope this helps</span>
ale4655 [162]3 years ago
3 0
\displaystyle\int \sec 3x\tan 3x\ dx=\int\dfrac{1}{\cos 3x}\cdot\dfrac{\sin 3x}{\cos 3x}\ dx=\int\dfrac{\sin 3x}{\cos^23x}\ dx\\\\\Rightarrow  \left|\begin{array}{ccc}\cos 3x=t\\-3\sin 3x\ dx=dt\\\sin 3x\ dx=-\frac{1}{3}\ dt\end{array}\right|\Rightarrow\int\left(-\dfrac{1}{3t^2}\right)dt=-\dfrac{1}{3}\int t^{-2}\ dt\\\\=-\dfrac{1}{3}(-t^{-1})+C=\dfrac{1}{3t}+C=\dfrac{1}{3\cos 3x}+C\\\\Answer:\boxed{\int \sec 3x\tan 3x\ dx=\dfrac{1}{3\cos 3x}+C}
You might be interested in
(4+4)÷22×2<br><br> plss someone answer hurry &lt;3
sineoko [7]

Answer:

first is 4+4=8.........second is 22×2=11 ..........third is 8÷11=0.7272727273 u can do it 0.72

Step-by-step explanation:

hope this help

7 0
3 years ago
Read 2 more answers
Which statement defines the term markup?
Alekssandra [29.7K]
A. The extra amount added to the selling price to arrive at the cost price
4 0
3 years ago
Read 2 more answers
What is 4 times 2. Will give brainliest HELPPPPPPPPPPPPPPPPPPPPPPPp
Temka [501]

the answer is 8

Step-by-step explanation:

4 + 4=8

double the number

8 0
2 years ago
Read 2 more answers
Find the circumference of a circle whose area is 24
zalisa [80]

The answer is: " 17.35 " .

__________________________________

→ The circumference of the circle is: " 17.35 units " .

__________________________________


The area, "A", of a circle:

A = \pi * r² ;

Note: \pi  = 3.14 .

The area of the circumference, "C", of a circle:

C = 2 \pi r .

__________________________________________

Given:

A = 24 ;

Use the formula for the area, "A" of a circle, to find the radius, "r" .

Then, plug the value obtained for "r" into the formula for the circumference, "C" , of a circle:

C = 2\pi r l

To solve for the circumference, "C", of the circle.

________________

A = \pi  *  r^{2} ;

24 = 3.14 * r² ;

↔ 3.14 * r² = 24 ;

Divide each side of the equation by "(3.14)" ;

[3.14 * r²] / 3.14 = (24) / (3.14) ;

to get:

→ r² = 7.64331210191 ;

Take the positive square root of each side of the equation;

to isolate "r" on one side of the equation; & to solve for the radius, "r" ;

→ ⁺√(r²) = ⁺√(7.64331210191) ;

to get:

→ r = 2.76281034802 ;

____________________________

Now, plug this "obtained value" for the radius, "r" into the equation for the formula for the circumference, "C" of a circle:

→ C = 2 \pi * r ;

to solve for the circumference, "C", of the circle:

→ C = 2 * (3.14) * (2.76281034802) ;

= (6.28) * (2.76281034802) ;

= 17.3504489856 ;

→ round to: " 17.35 units" .

__________________________________

The answer is: " 17.35 " .

__________________________________

→ The circumference of the circle is: " 17.35 units " .

__________________________________

6 0
3 years ago
If 7 liters of petrol cost $14.70, calculate the cost of 15 liters of petrol.​
Alex73 [517]

Hi

7 = 14.70

15= X

so :  X =  15*14.70 /7 = 31.5

15 liters  of petrol cost  31.5

5 0
3 years ago
Read 2 more answers
Other questions:
  • Which function is increasing?
    12·1 answer
  • Simplify. Assume x and y are nonnegative.
    15·2 answers
  • A bag contains 2 blue, 4 green, and 3 white chips. What is the probability of drawing a blue chip, replacing it, then drawing a
    11·1 answer
  • Carly is saving money. Last month, she saved $120. This month, Carly saved 30% percent more than last month. How much money did
    9·1 answer
  • What is log 1/36 divided by log 6
    5·1 answer
  • Solve the expression 8 + (9 x one third ) ÷ 3 using PEMDAS. (4 points)
    7·1 answer
  • Quisssssss :'^(<br><br>A = 10<br><br>2A + 4A - 3A​
    6·2 answers
  • A bad contains two red marbles, six blue marbles and seven green marbles. If two marbles are drawn out of the bag, what is the p
    15·1 answer
  • Oscar has elected to have 23% of his federal income tax withheld as state income tax. if $154.00 was withheld as federal income
    9·1 answer
  • Which set of ordered pairs could be generated by an exponential function?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!