Unit Circle

Front

sin 90^o

Back

1

Front

Cos 180^o

Back

-1

Front

sin 0

Back

0

Front

cos 0

Back

1

Front

sin 270^o

Back

-1

Front

cos 90^o

Back

0

Front

cos 270^o

Back

0

Front

sin 180^o

Back

0

Front

tan 90^o

Back

und

Front

cot 270^o

Back

0