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OpenStudy (anonymous):
http://i.imgur.com/c79ixik.png can anyone prove this please?
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OpenStudy (amistre64):
you simply have to play with your trig identities
OpenStudy (amistre64):
cos(a+b) = cos(a)cos(b)-sin(a)sin(b) sin(a+b) = sin(a)cos(b)+sin(b)cos(a)
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