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