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
DerKrebs [107]
3 years ago
13

Please help me with this question!! I also need the steps

Mathematics
1 answer:
e-lub [12.9K]3 years ago
8 0

Hi there!

\large\boxed{x = \frac{\pi}{3} \text{ and } \pi}

We are given:

cos(7x)cos(4x) = -1 - sin(7x)sin(4x)

Begin by moving all terms with variables to one side:

cos(7x)cos(4x) + sin(7x)sin(4x) = -1

The corresponding trig identity is cos(A - B). Thus:

cos(7x - 4x) = cos(7x)cos(4x) + sin(7x)sin(4x) = -1

cos(3x) = -1

cos = -1 at  π, so:

3x = π

x = π/3

We can also find another solution. Let 3π = -1:

3x = 3π

x = π

Thus, solutions on [0, 2π) are π/3 and π.

You might be interested in
A box of golf balls costs $7.32 at that rate, how much will a box of 15 golf balls cost
pogonyaev

Answer:

$109.80

Step-by-step explanation:

since each ball cost $7.32 and you want to buy 15 then you would multiply 7.32 which then gives you the answer of 109.80

i hope that helps

:)

i promise i'm not giving you false info i'm in algebra


7 0
3 years ago
The cost of renting a car is $26.60 plus $10 per day. Sales tax is 6%. Which 2 expressions represent the cost of renting a car f
docker41 [41]

Answer:

(26.60+(10*d)) * 6% = X

x=total cost

4 0
3 years ago
HELP IN NEED!
laiz [17]

Answer:

AB=12\sqrt{3}\ cm

Step-by-step explanation:

If AB is tangent to the circle, then angle ABO is right angle and triangle AOB is special 30^{\circ}-60^{\circ}-90^{\circ} triangle. In this triangle, the leg that is opposite to the angle of 30° is half of the hypotenuse. Thus,

AO=2BO=2\cdot 12=24\ cm.

By the Pythagorean theorem,

AB^2=AO^2-BO^2,\\ \\AB^2=24^2-12^2,\\ \\AB^2=576-144=432,\\ \\AB=12\sqrt{3}\ cm.

6 0
3 years ago
Help please plese snrghhchrgujkbrgjkemgktmbwb35tkh3iu5thj5l
Nataly_w [17]

Answer:

The circle is 80% green

Step-by-step explanation:

4/5 are green

4÷5 is .8, or 80%

8 0
2 years ago
Read 2 more answers
PART 1: Identify the two equivalent forms for 3/5% below
kaheart [24]
Part 1: Equivalent fraction=3/500
Equivalent Decimal= .006
Part 2: A and E
4 0
3 years ago
Other questions:
  • Hi the mean of the following data $ 11,
    12·1 answer
  • HELP ME PLEASE !! IM SO CONFUSED
    15·1 answer
  • Speed (mph)
    10·1 answer
  • What is the geometric mean of 5 and 18?
    11·2 answers
  • Compare and contast the procedures of adding and subtracting fractions with multiplying
    14·1 answer
  • Two is subtracted from a number the the difference is divided by 3. the result is 30
    12·1 answer
  • Did I get this right?
    10·1 answer
  • A 15-g sample of radioactive iodine decays in such a way that the mass remaining after t days is given by
    12·1 answer
  • EASY POINTS PLEASE HELP ASAP
    9·2 answers
  • Given f of x is equal to the quantity x plus 6 end quantity divided by the quantity x squared minus 9x plus 18 end quantity, whi
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!