1.	Find the value of sin (x + y) if , sin x = , and sin y = .
		A.		B.
		C.		D.
		Hint
	2.	If x and y are acute angles such that sin x = and sin y = , what is the value of cos (x - y)?
		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.	If angles x and y are between 0° and 180° such that cos x = - and cos y = , what is the value of sin (x + y)?
		A.		B.
		C.		D.
		Hint