1.	Complete the identity _______.
		A.	cos x	B.	tan x
		C.	cot x	D.	sin x
		Hint
	2.	Complete the identity _______.
		A.	csc x	B.	sec x
		C.	tan x	D.	cot x
		Hint
	3.	Complete the identity sin sin (-) - cos ___.
		A.	- cos 0	B.	-1
		C.	1	D.	sin 0
		Hint
	4.	Complete the identity = _______.
		A.	sin x	B.	sec x
		C.	tan x	D.	-cos x
		Hint
	5.	Complete the identity sin4 x - cos4 x = __________.
		A.	sin2 x - cos2 x	B.	1
		C.	0	D.	tan4 x
		Hint