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
labwork [276]
3 years ago
12

Please can someone prove this equation

Mathematics
1 answer:
zubka84 [21]3 years ago
6 0

Answer:

see explanation

Step-by-step explanation:

Using the trigonometric identity

sin²x + cos²x = 1

Consider the left side

2cos²A - 1 ← replace 1 by sin²A + cos²A

= 2cos²A - ( sin²A + cos²A)

= 2cos²A - sin²A - cos²A

= cos²A - sin²A = right side ⇒ verified



You might be interested in
System OT<br> W + b =13<br> 6.5w + 2b = 57.5
mixer [17]

Answer:   w = 7,  x = 6

Step-by-step explanation:  Solve by substitution

W + b = 13

rewrite as   b = 13 - w  and substitute that value for b in the second equation

6.5w + 2b = 57.5  Then solve for w

6.5w + 2(13-w) = 57.5 . Distribute

6.5w + 26 - 2w = 57.5 .  Subtract 26 from both sides. Combine like terms and simplify

6.5w - 2w = 57.5 - 26

4.5w = 31.5  Divide both sides by 4.65

w = 7 . Substitute 7 for w in the first equation and solve for b

7 + b = 13 . Subtract 7 from both sides

b = 6

6 0
3 years ago
The sum of three consecutive positive numbers is 147. Find the product of the greatest and the
Dima020 [189]

Answer:

2400

Step-by-step explanation:

x+y+z=147

x+(x+1)+(x+2)=147

3x+3=147

3x=144

x=48

The three consecutive positive numbers are 48, 49, and 50.

48 • 50 = 2400

5 0
3 years ago
Changing this into General Form (Ax + By + C = 0)<br><br> x = -9 {2 ≤ y ≤ 6}
ahrayia [7]

Answer:

0x8y

Step-by-step explanation:

x is negative so i turned it into a negative number b, y is - so 8 and o is slope

4 0
4 years ago
8n=7n + 1/2<br>please help me
natka813 [3]
I hope this helps you




8n=7n+1/2



2.8n=7n+1



16n-7n =1



9n=1



n=1/9


7 0
3 years ago
Read 2 more answers
If angle B measures 25°, what is the approximate perimeter of the triangle below? A right triangle is shown. Angle A is 90 degre
Artyom0805 [142]

Answer:

If angle B measures 25°, the approximate perimeter of the triangle is 10.48 units. A right triangle is shown. Angle A is 90 degrees and angle B is 25 degrees.

Step-by-step explanation:

8 0
2 years ago
Other questions:
  • A square has a side length of 22 meters what is the area of the square
    7·1 answer
  • The standard diameter of a golf ball is 42.67 mm. A golf ball factory does quality control on the balls it manufactures. Golf ba
    9·2 answers
  • Lina has 12 coins in her purse. D of them are dimes and the rest are quarters. How many quarters does Lina have? How much money
    5·1 answer
  • Is 5/8 and 7/14 proportional
    15·1 answer
  • The Rotation R maps all 60° about O the center of the regular hexagon. State the image of B for the following rotation. R 2 o R
    14·1 answer
  • Of the 13,955,000 Asians age 25 and over in the U.S.,8,107,000have completed at least a bachelors degree. What percentage is thi
    12·1 answer
  • Solve -2 1/4÷(-1 1/2) =?
    5·1 answer
  • The equation f = V + at represents the final velocity of an object, f, with an initial velocity, w, and an acceleration rate,
    6·1 answer
  • In order to prove the triangles congruent by ASA, which statement needs to be given?
    9·1 answer
  • A Clock had a radius of 5 inches. Find the distance the minute hand tracked from 2 to 6
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!