Positive or negative in the Unit Circle

 $\cos0\degree$  

• 0

• 1

• -1

• undefined

 $\tan270\degree$  

• 0

• 1

• -1

• undefined

 $\sin90\degree$  

• 0

• 1

• -1

• undefined

 $\sin220\degree$  

• positive

• negative

• undefined

 $\tan275\degree$  

• positive

• negative

• undefined

 $\cos72\degree$  

• positive

• negative

• undefined

 $\tan190\degree$  

• positive

• negative

• undefined

 $\cos350\degree$  

• positive

• negative

• undefined

 $\sin178\degree$  

• positive

• negative

• undefined

Cosine is negative in the following quadrants:

• I & II

• I & III

• II & III

• II & IV