1.	If sin = and has its terminal side in the first quadrant, find the exact value of cos 2.
		A.		B.	1
		C.		D.
		Hint
	2.	Find sin 2 if sin = and 0° < < 90°.
		A.		B.
		C.		D.
		Hint
	3.	If cos = and has its terminal side in the first quadrant, find the exact value of cos .
		A.	-	B.
		C.		D.	-
		Hint
	4.	Find the value of tan 2 if sin = and 0 < < .
		A.		B.	-
		C.		D.
		Hint
	5.	Use a half-angle identity to find the exact value of tan .
		A.	-	B.
		C.	-	D.
		Hint