Good day,hope I'm welcome

I'm having problem solving these

Find the circular functions of the following:

a. 36 deg

b. 22 deg and 30 minutes

c. 15 deg = ( 30 deg / 2 )

For a. I tried to find special angles(30,60,45,and other quadrantal angles) that would sum up to 36 deg , but I just can't find any.

Same goes for letter b.

And for letter c. I can't think of any procedure that will direct me to the correct answer, using 30 deg / 2.

Hoping for replies.

Thanks