If I reduce the evaluation of a trigonomic function, what is the evaluation of the same fucntion at it's reference angle? sin 245* and cos 245*

Question

If I reduce the evaluation of a trigonomic function, what is the evaluation of the same fucntion at it's reference angle?  sin 245* and cos 245*

hero · Answer

What's preventing you from figuring this out on your own?

anonymous · Answer

I have no idea how to figure it out

hero · Answer

Find the reference angle, then take the sine and cosine of it.

anonymous · Answer

Sin245 is on the third quadrant on the circle therefore, 245-180=65 degree use your calculaTor to see what is sin65 then sin245 is negatve number because in the third yquad