Topic: trigonometry identities list of topics
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	Some trig expressions		2004-05-23
		From A student: Prove: sin A + sin B = 2sin(A+B/2)cos(A-B/2) cos A - cos B = -2sin(A+B/2)sin(A-B/2) cos A + cos B = 2cos(A+B/2)cos(A-B/2) sin A - sin B = 2cos(A+B/2)sin(A+B/2) Answered by Penny Nom.
	An identity in trigonometry		2002-10-17
		From Alex: I really need help with proving this identity. (1+cosx+sinx)/(1+cosx-sinx) = secx + tanx Answered by Penny Nom.

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