Topic: triginometry list of topics
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	siin (A) and sin (A/2)		2013-05-09
		From shanaia: given that sin A=4/5 and A is obtuse.find sin (A/2) Answered by Penny Nom.
	sin x/ 1+cos x = 1-cos x/ sin x		2009-05-30
		From rita: prove: sin x/ 1+cos x = 1-cos x/ sin x Answered by Stephen La Rocque.

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