The figure below for a right angle triangle where the hypotenuse has lenght 1,
show that :
sin(A-B)=sinAcosB-sinBcosA
HINT: From the diagram sin(A-B) = X/h
Find other expressions for X and h substitute these into the above equation.
Diagram: http://s975.photobucket.com/albums/ae233/chilok008/?action=view¤t=IMG00086-20100718-1245.jpg&newest=1
trigonometry prove
2010-07-25 2:16 am
回答 (2)
2010-07-25 3:06 am
2010-07-25 8:17 pm
此compound angle formula 亦可以euler's formula (e^ix=cosx+isinx)證明
收錄日期: 2021-04-22 00:52:54
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https://hk.answers.yahoo.com/question/index?qid=20100724000051KK01123