It is known

and

(if you want to determine cosine of 30° you should draw the perpendicular line to the x-axis and find the point of intersection, the value of x-coordinate is the cosine of 30°).
The angle

and

(see image).
The angle

and

(see image).
F(x). "f(x) = ... " is the classic way of writing a function. And there are other ways, as you will see! .... Example: {(2, 4), (2,5), (7,3)} is not a function because {2,4} and {2,5} means that 2 could be related to .
Answer:
Because a prism travels at the speed of light.
Answer:
answer ; https://socratic.org/questions/a-discounted-concert-ticket-costs-14-50-less-than-the-original-price-p-you-pay-5#585652
Step-by-step explanation:
Answer:
Two rays that share the same endpoint form an angle. The point where the rays intersect is called the vertex of the angle. The two rays are called the sides of the angle.
Step-by-step explanation: