1.	Find the value of sin (x + y) if , sin x = , and sin y = .
		A.		B.
		C.		D.
		Hint
	2.	Use the sum or difference identity for tangent to find the exact value of tan 255°.
		A.		B.
		C.		D.
		Hint
	3.	Use the sum or difference identity for cosine to find the exact value of cos 105°
		A.		B.
		C.		D.
		Hint
	4.	Find the value of cos (x - y) if 0 < x < , 0 < y < , sin x = , and cos y = .
		A.		B.
		C.		D.
		Hint
	5.	Complete the identity tan ( - A) = ________.
		A.	-cot A	B.	cot A
		C.	tan A	D.	-tan A
		Hint