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Mathematics 19 Online
OpenStudy (anonymous):

Verify the identity: Cos^2(theta) - Sin^2(theta) = 2Cos^2(theta)-1

OpenStudy (anonymous):

hmmmm . you want to prove this right? lemme try

OpenStudy (anonymous):

it is damn simple dude! you know that |dw:1382212765930:dw|

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