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