Problem 35 of 7
Determine trig signs for angle location An angle of 180 degrees.
Hints
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use coordinate signs.
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Use coordinate signs for quadrants I-IV and axis angles.
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Solution
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1. Identify signs of x and y in the quadrant.
2. Assign cos from x and sin from y.
3. Use tan=y/x to determine tangent sign.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Mnemonic answers with incorrect quadrant signs.