1.	Simplify cos x tan x.
		A.	sin x	B.	cos x
		C.	1	D.	csc x
		Hint
	2.	Express cot (-840°) as a trigonometric function of an angle in Quadrant I.
		A.	- cot 60°	B.	- tan 60°
		C.	tan 60°	D.	cot 60°
		Hint
	3.	Which identity is not a Pythagorean identity?
		A.	tan2 + 1 = sec2	B.	1 + cot2 = csc2
		C.	sin2 + cos2 = 1	D.
		Hint
	4.	Simplify the expression sin x + 4 cos x + 2 sin -x - 2 cos -x
		A.	0	B.	3 sin x + 2 cos x
		C.	2 cos x - sin x	D.	1
		Hint
	5.	Which of the following is a valid trigonometric identity.
		A.	tan + cot = sec csc
		B.	tan2 + cot2 = sin cos
		C.	tan + cot = sin cos
		D.	Tan2 + cot2 = sec csc
		Hint