Answer:
-1
Step-by-step explanation:
because when y is 2, x is -1
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:
5
Step-by-step explanation:
it's not necessary to round to the nearest tenth just simply half 10
5/6 + 3/6 = 8/6, you divide 6 into 8, and get 1 2/6, you can reduce that to 1 1/3
Sentence: one and one third
Answer:
No real solution
Step-by-step explanation:
There is no perfect squares in 50