Question

Given sin 0 = 1/2, find cos 0. (Slashes through the 0's of course)

Answer 1

you cannot solve this exactly. you only know that cosine could be
\[\frac{\sqrt{3}}{2}\] or
\[-\frac{\sqrt{3}}{2}\]

Answer 2

you should have this triangle in your head. hypotenuse is 1, short side is
\[\frac{1}{2}\] and long side is
\[\frac{\sqrt{3}}{2}\] by pythagoras. the small angle is
\[\frac{\pi}{6}\]and the larger one is
\[\frac{\pi}{3}\]

Answer 3

i would have drawn my triangle like this

but yours is fine i guess

Answer 4

yea now i really win. how can i put a triangle with hypotenuse 1 inside the unit circle???