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OpenStudy (anonymous):
find the exact value of sin (135 degrees-30 degrees )
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OpenStudy (jdoe0001):
http://www.pleacher.com/mp/mgifs/gifs1/sumdif.gif notice the 2nd identity listed there
OpenStudy (anonymous):
sin105 degrees
OpenStudy (amoodarya):
sin105=sin(45+60) then use sin(a+b) =sina cos b + cas a sin b
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