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posted by Mary Wednesday, April 24, 2013 at 10:59am.

Simplify arctan 1/3 + arctan 2/3(round to the nearest degree).

tan(arctan 1/3 + arctan 2/3) = (1/3 + 2/3)/(1-(1/3)(2/3)) = 9/7 arctan(9/7) = 52.13°

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