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
notka56 [123]
3 years ago
8

For what value of theta does sin 2theta = cos(theta+30)? Show steps

Mathematics
1 answer:
kolbaska11 [484]3 years ago
8 0

Answer: Ф = 20

Step-by-step explanation:

sin2Ф = cos (Ф+ 30 )

if sinα = cosβ , then α and β are complementary ,that is they add up to be 90^{0}.

Therefore : 2Ф + Ф + 30 = 90

3Ф + 30 = 90

3Ф         = 90 - 30

3Ф        = 60

Ф          = 20

You might be interested in
y = x2 - 6x - 8 Complete the square in the quadratic equation in order to write the equation in vertex form.
Airida [17]

Answer:

y = (x-3)^2 - 17

Step-by-step explanation:

To complete the square, take the middle term bx and divide it in two. Then take the square.

x^2 - 6x - 8 has bx = -6x. Take -6/2 = -3. Square -3^2 = 9.

Now to finish completing the square add 9 and subtract 9 from one side.

y = x^2 - 6x - 8

y = (x^2 - 6x +9) -9 - 8

y = (x-3)^2 - 17

8 0
3 years ago
5% times blank equals 2.5<br><br> NEED ASAP
lapo4ka [179]

Answer:

0.5

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
In lancaster, the library is 9 miles due south of the courthouse and 4 miles due west of the
skad [1K]

use brainly to find the answer

8 0
2 years ago
Suppose you are traveling straight from Los Angeles, California to Albuquerque, New Mexico, stopping overnight in Flagstaff, Ari
Roman55 [17]
<span>D. L.A. to Flagstaff, 465 miles; Flagstaff to Albuquerque, 345 miles

The answer above is correct.

810 - 120 = 690 ; 690 / 2 = 345 mi   ( Flagstaff to Albuquerque )

810 - 345 = 465 mi   ( L.A. to Flagstaff )


</span>
3 0
3 years ago
The total cost of Anfä's trip to the dentist was $628.35. She paid a flat fee of $89.95 which included the checkup:
daser333 [38]

Answer:

The cost of each cavity filling was $ 134.60.

Step-by-step explanation:

Given that the total cost of Anfa's trip to the dentist was $ 628.35, and she paid a flat fee of $ 89.95 which included the checkup: cleaning and then had 4 cavities filled, each of which cost the same amount, to determine which shows the correct equation and value of x, the cost of each cavity filling, the following calculation must be performed:

(628.35 - 89.95) / 4 = X

538.4 / 4 = X

134.6 = X

Therefore, the cost of each cavity filling was $ 134.60.

5 0
3 years ago
Other questions:
  • write a story problem that can be solved by finding the sum of 506,211 and 424,809. then solve the problem
    15·2 answers
  • What is being done to the variable in the equation y + 8.5 = 17.2? The number 8.5 is being added. The number 8.5 is being subtra
    9·2 answers
  • The lines on a 2 cup liquid measuring cup divide each cup into eighths. If you measure 1 cups of water, between
    15·2 answers
  • What is not always true about 2 regular pentagons
    10·2 answers
  • PLS HELP!!!!What are the sine, cosine and tangent ratios of<br>angle W in the triangle below​
    10·1 answer
  • 18. Describe the shape of the data distribution.
    9·1 answer
  • HELLLPP ANY HELPS PLEASE I NEED HELP I AM RUNNING OUT OF TIME !!
    10·2 answers
  • 1 x (3 + 7) = (1 x 3) + (1 x 7) is an example of which property?
    7·1 answer
  • The legend of s u c c
    9·1 answer
  • If anyone can help with this please
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!