Evaluate .
Answer and explanation
Correct answer: A.
- Step 1: The standard antiderivative is with . Evaluate at endpoints: . **Answer: . Why not the others:** " unscaled angle" evaluates without scaling by , or confuses with ; " arctan form" confuses the arcsine radical with the rational arctangent form; " numerical value" confuses the argument with the resulting angular radian value.
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