`arctan(1)` Evaluate the expression without using a calculator.

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Chapter 4, 4.7 - Problem 10 - Precalculus (3rd Edition, Ron Larson).
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loves2learn | (Level 3) Salutatorian

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This asks you what value of tan equals 1 (`tanx=1 ` ). Remember that tan is y/x. Using a unit circle, you can determine that the answer is `pi/4 ` .

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