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posted by Anonymous on Sunday, February 17, 2013 at 8:59pm.

cos^(2) 20 degrees + sin^(2) 20 degrees +pi/2

cos^(2) 20 degrees + sin^(2) 20 degrees +pi/2 = (cos^(2) 20 degrees + sin^(2) 20 degrees) +pi/2 = 1 + π/2

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