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
alekssr [168]
3 years ago
6

2cos^2A-cos2A-1=0 Help

Mathematics
1 answer:
kondor19780726 [428]3 years ago
8 0

Answer:

steps below

Step-by-step explanation:

Are you going to solve the value of A or just a proof the equation

cos 2A = cos² A - sin² A

2cos²A-cos2A-1 = 2cos²A - (cos² A - sin² A) - 1 = cos² A + sin² A - 1

2cos²A-cos2A-1 = 1 - 1 = 0

A: 90° or 270° or 450° .....

You might be interested in
Rewrite (2x + 8) + 4 using the associative property. Then simplify.
skelet666 [1.2K]

Answer:

2x + 12

Step-by-step explanation:

Example of Associative Property Addition:

a + (b+c) = b + (a+c)

Now, implement it to the given expression:

(2x+8) + 4 = 2x + (8+4)

That simplifies to:

2x + 12

4 0
3 years ago
Read 2 more answers
Luetta is shopping and find a $200 video game that is mark down by 5% how much will be taken off the price in dollars
viva [34]

Answer:

$10.00

Step-by-step explanation:

$200 x . 05 = $10.00

5 0
3 years ago
Read 2 more answers
The cost price of 18 sweaters is Rs425 per sweater and the total gain of the shopkeeper is Rs 6,750 1 find the sale price of eac
Nostrana [21]

Answer:

1. Sales price per sweater= Rs 800

2. percentage = 46.875% = 46.88%

Step-by-step explanation:

Given;

Cost price = Rs425 per sweater

Number of sweaters = 18

Total gain = Rs 6,750

Total cost price = cost price × number of sweaters

Total cost price = 18 × Rs425 = Rs 7,650

Total sales price = total gain + total cost price

Total sales price = Rs 6,750 + Rs 7,650

Total sales price = Rs 14,400

Sales price (per sweater) = Rs 14,400/18 = Rs 800 per sweater

Profit percentage = total gain/total sales price × 100%

Profit percentage = Rs 6,750/Rs 14,400 × 100%

Profit percentage = 46.875% = 46.88%

8 0
3 years ago
Math HELPPPO MEWEEE PLZZZZ
Keith_Richards [23]

Answer:

63.5 is the correct answer

8 0
3 years ago
1 2 points What quadrant number will this order pair (-4,-5) appear in? O Quadrant 4 Quadrant 1 Quadrant 3 O Quadrant 2.​
Savatey [412]

Quadrant 3

Since both the x and y are negative, it will be in the third quadrant.

7 0
3 years ago
Other questions:
  • if a set covers a range of points, including those between isolated points, and cannot be written as a list, it is called
    11·1 answer
  • What is the inverse of the equations along with steps how to solve for it
    12·1 answer
  • Explain why it might be useful to approximate the value rather than use the exact value
    11·1 answer
  • I need to know where to plot the points on the graph <br><br>30 points
    10·1 answer
  • Solve the system by substitution. SHOW WORK<br> -X - Y - Z=-8<br> - 4X +4Y +5Z=7<br> 2X + 2Z=4
    12·1 answer
  • Which inequality represents all possible solution of -6n&lt; -12
    10·1 answer
  • What is -5 1/3 - 2 1/3 ?
    6·1 answer
  • What is the ratio of $.81 to $1 and $2.63 to $1?
    14·2 answers
  • What is the exact area of a circle with a diameter of 18 feet?
    7·1 answer
  • Find the 12th term of the sequence: 48, 44, 40, 36...<br> A.4 B.8 C.12 D.16 ​
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!