1.	Complete the identity = ________.
		A.	tan x	B.	cot x
		C.	sin x	D.	cos x
		Hint
	2.	If cos = and has its terminal side in the first quadrant, find the exact value of sin 2.
		A.	2	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