Given:
There are given that the cos function:

Explanation:
To find the value, first, we need to use the half-angle formula:
So,
From the half-angle formula:

Then,
Since 105 degrees is the 2nd quadrant so cosine is negative
Then,
By the formula:

Then,
Put the value of cos210 degrees into the above function:
So,

Final answer:
Hence, the value of the cos(105) is shown below:
Answer:
I can't understand.. can you add pictures also
By solving the equation
1/2 +x =4/7
x = 4/7 -1/2
x= 1/14
All of these points have the same y coordinate so this is a horizontal line which has a slope of 0.
Answer:
I think the question is not correct because it can't be factorize
Step-by-step explanation: