1.	Solve sin x cos x - cos x = 0 for principal values of x. Express solutions in degrees.
		A.	150°, 90°	B.	30°, 60°
		C.	60°, 90°	D.	30°, 90°
		Hint
	2.	Solve the equation cos 2x = sin x for 0° x < 360°.
		A.	30°, 150°, 270°	B.	30°, 210°, 270°
		C.	30°, 90°, 150°	D.	90°, 150°, 270°
		Hint
	3.	Solve 2 cos + 1 < 0 for 0 < 2.
		A.	< <	B.	< <
		C.	< < 2	D.	0 < or < < 2
		Hint
	4.	Solve cos x - 1 = 0 for all real values of x.
		A.	+ 2k, +2k	B.	+ k
		C.	+2k, + 2k	D.	+2k, + 2k
		Hint
	5.	Solve sec2 x = - 2 for -90° < x < 90°.
		A.	-30°, 30°	B.	60°
		C.	0°	D.	-60°, 60°
		Hint