1.	Complete the identity _______.
		A.	cot x	B.	tan x
		C.	sin x	D.	cos x
		Hint
	2.	Complete the identity _______.
		A.	csc x	B.	tan x
		C.	sec x	D.	cot x
		Hint
	3.	Find a numerical value of one trigonometric function of x if
		A.		B.
		C.		D.
		Hint
	4.	Complete the identity sin sin (-) - cos ___.
		A.	sin 0	B.	1
		C.	-1	D.	- cos 0
		Hint
	5.	Complete the identity sin4 x - cos4 x = __________.
		A.	tan4 x	B.	1
		C.	sin2 x - cos2 x	D.	0
		Hint