Problem 128 of 7
Explain why both algebraic roots are not valid for cot theta given theta is in Quadrant I.
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use quadrant information to choose sign.
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Quadrant must determine the sign of the trig value.
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Solution
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1. Recognize that squaring loses sign information.
2. Determine the sign of the target trig function in the quadrant.
3. Choose only the root with that sign.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Giving both signs after quadrant information is supplied.