cos(theta + pi)

sin(theta-3pi/2)

cos(2pi/9)cos(pi/18) + sin(2pi/9)sin(pi/18)

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- March 21st 2009, 05:21 PMdesperate_on_sunday_nighttrigonometry
cos(theta + pi)

sin(theta-3pi/2)

cos(2pi/9)cos(pi/18) + sin(2pi/9)sin(pi/18) - March 21st 2009, 05:55 PMskeeter