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Mathematics 13 Online
OpenStudy (anonymous):

sin(22.5 deg)=sqrt(2-sqrt(2))/2 what is cos(22.5 deg), tan 22.5 deg?

zepdrix (zepdrix):

|dw:1349906671295:dw| Hmm it looks like they used the half angle formula to the sine :) Do you remember that formula? :D

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