# Pre-Calculus

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

• Pre-Calculus -

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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