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
Artemon [7]
3 years ago
14

Show that the equation is not an identity by finding a value of x for which both sides are defined but not equal. cos x - cos x

sinx = cos3 x
Mathematics
2 answers:
dangina [55]3 years ago
4 0
The answer is 0 because 180 degrees does not make a valid statement
Mashutka [201]3 years ago
3 0

Answer:

The answer is pi/4

Step-by-step explanation:

You substitute each x for "pi/4", you will see that the equation is incorrect, the two values are no longer equal.

You might be interested in
The sum of all the positive terms in the geometric sequence 54, - 36, 24, - 16, ... is
Annette [7]

Answer:

  B.  97.2

Step-by-step explanation:

The sequence of positive terms is ...

  54, 24, 10 2/3, 4 20/27, ...

This sequence has first term 54 and common ratio 24/54 = 4/9. The sum of the infinite series is ...

  S = a1/(1 -r) = 54/(1 -4/9) = 54(9/5)

  S = 97.2

The sum of the positive terms in the infinite series is 97.2.

8 0
2 years ago
Suppose xy=4 and dy/dt=-2. Find dx/dt when x=-3
nirvana33 [79]
Dy/dx = dy/dt  *   dt/dx

xy = 4

y + x(dy/dx) = 0      by implicit differentiation. 

x(dy/dx) = -y

dy/dx = -y/x

<span>dy/dx = dy/dt  *   dt/dx             dy/dt = -2
</span>
<span>-y/x = -2 *   dt/dx
</span>
y/(2x) = dt/dx

dt/dx =  y/(2x)

dx/dt = 2x/y
  
When x = -3,   xy = 4,  y = 4/x = 4/-3 = -4/3

dx/dt = 2*-3/(-4/3) = -6 *-3/4 = 18/4 = 9/2 = 4.5

dx/dt = 4.5
3 0
3 years ago
Read 2 more answers
One zero of x3 – 3x2 – 6x + 8 = 0 is -2. What are the other zeros of the function?
hram777 [196]
Consider this solution, if it is possible, check the result:
1) if to divide polynomial 'x³-3x²-6x+8' on 'x+2' result is: x²-5x+4, then x³-3x²-6x+8=(x+2)(x²-5x+4);
2) x²-5x+4=(x-1)(x-4), then
3) x³-3x²-6x+8=(x+2)(x-1)(x-4).
4) zeros are: -2;1;4. Other zeros are: 1 and 4.
Answer: 1;4.
7 0
3 years ago
What’s the answer????
BlackZzzverrR [31]

Answer:

1. 0.6

2. 0.25

Step-by-step explanation:

because math

7 0
3 years ago
You have 400 feet of fencing to enclose a rectangular plot. Find the length and width of the plot that will maximize the area. W
3241004551 [841]
Well, we can denote L and W for the length and width respectively. Lets say the A is the area, we have: 1. A=(L × W) as well as 2. 2(L+W)=400. We rearrange the second equation to get 3. W=200-L. From this, we can see that 0<L<200. Substitute the third equation into the first to get A=(200L-L²). put this formula into the scientific calculator and you will find a parabola with a maximum. That would be the maximum area of the enclosed area. Alternatively, we can say that L is between 0 and 200 when the area equals 0. (The graph you find will be  area against length). As the maximum is generally found halfway, we substitute 100 into the equation and we end up with 10000.

Hope this helps.
6 0
3 years ago
Other questions:
  • If Jim is x years old now, and his sister is twice as old, how old was his sister 7 years ago?
    8·2 answers
  • W<br>CUSIC UL We acute angles in the<br>28​
    8·1 answer
  • Describe the relationship between and when the two lines are perpendicular to . Also describe the relationship between and when
    5·2 answers
  • How many times greater is the value of the 7 in 640,700 than the value of the 7 in 67,040
    6·1 answer
  • What is the equation that passes through (0,5) and (4,8) in intersect form
    14·1 answer
  • the ferris wheel makes 12 revolutions per ride how far would someone travel during one ride. the diameter is 63 feet
    12·2 answers
  • The cost of g gallons of gasoline can be modeled by C(g) = 2.25g
    13·1 answer
  • Having trouble i don't understand the problem
    5·1 answer
  • A map of Texas has a scale of 1 in : 65 mi. The distance from dallas to San Antonio is 260 miles. What is the distance on the ma
    7·1 answer
  • Look at the pic below an help pls
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!