Question

The y-value for y = cos(x) when x = 180° is 1. is true or false?

Answer 1

help me out plss

Answer 2

Draw a unit circle, x^2 + y^2 = 1.

Remember that by definition, the cos(angle) is the value of x on that unit circle for that angle.

Given that, what is the value of cos(180) = ?

Answer 3

@sugargirl, we don't just hand out answers here and you certainly don't interrupt someone when they are tutoring. Especially if they are a Moderator! ;-)

Answer 4

i dont want the ansers i just want to lear how to do it !

Answer 5

ohk @bryanomar

Answer 6

precisely

Answer 7

ohk@jamesj

Answer 8

so no one is going to help me because you think i only want the answer?

Answer 9

Do what I said. here's the diagram:

Answer 10

Make sense? In the diagram we are using the basic definition of what the cosine of an angle is.