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