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Mathematics 13 Online
OpenStudy (anonymous):

find the exact value of sin (135 degrees-30 degrees )

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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