Which of the following are solutions to the equation 2cos2x-1=0
1 answer:
Answer:
x = π/4 and 5π/4
Step-by-step explanation:
Given the expression;
2cos²x - 1 = 0
2cos²x = 0+1
2cos²x = 1
cos²x = 1/2
cos x = ±√1/2
cos x = ±0.7071
x = arccos(±0.7071)
x = ±45 degrees
Convert to radians
Sence 180° = π rad
45° = x
x = 45π/180
x = π/4
If x = -45°
Since cos is negative in the 3rd quadrant
x = 180 + 45
x = 225°
x = 225π/180
x = 45π/36
x = 5π/4
You might be interested in
5678 divided by 45.7 is 124.245...
Answer:
p= 7 socks
Step-by-step explanation:
gift card:$25
socks:$4
p = 7

b) It is a cubic function of 4 terms.
- In this case p(3) = t + 2 is synonymous for p = 3 + 2. Remember p is synonymous for y. So in this equation it is p = 5.

Hope this helps!
Answer:
108
Step-by-step explanation:
add all of the numbers together and thats what you get :)
Answer:
180-123= 57
57+42=99
180-99=81
x=81°