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

Question

anonymous · Answer

help me out plss

jamesj · Answer

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) = ?

jamesj · Answer

@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! ;-)

anonymous · Answer

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

anonymous · Answer

ohk @bryanomar

jamesj · Answer

precisely

anonymous · Answer

ohk@jamesj

anonymous · Answer

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

jamesj · Answer

Do what I said.  here's the diagram:

jamesj · Answer

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