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