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