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.	Find the value of cos (x - y) if 0 < x < , 0 < y < , sin x = , and cos y = .
		A.		B.
		C.		D.
		Hint
	4.	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
	5.	Complete the identity tan ( - A) = ________.
		A.	tan A	B.	-cot A
		C.	-tan A	D.	cot A
		Hint