How does this work? Please help.
y = cos x.
And then i have a chart of 30 degrees, 60 degrees, and 90 degrees.

Question

How does this work? Please help. 
y = cos x.
And then i have a chart of 30 degrees, 60 degrees, and 90 degrees.

anonymous · Answer

|dw:1363012781663:dw|

anonymous · Answer

$\cos(60)=\frac{1}{2}$ from the picture
and also $\cos(30)=\frac{\sqrt{3}}{2}$

anonymous · Answer

What does cos have to do with the equation? Because what im most confused about is the cos and not know what to put into my calculator.

anonymous · Answer

@satellite73

anonymous · Answer

cosine in a right triangle is "adjacent over hypotenuse"
if you make the hypotenuse 1, it is just the "adjacent" side

anonymous · Answer

look at the unit circle on the last page of the attached cheat sheet
find 30 degrees, then look at the coordinates on the circle
the first coordinate is cosine, the second coordinate is sine

anonymous · Answer

Oh okay. This helps. Thank you.