Problem 28 of 7
Determine the signs of sine and cosine in Quadrant IV.
Hints
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use coordinate signs on unit circle.
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Location must be a quadrant or axis position on the coordinate plane.
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Solution
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1. Recall cosine is the x-coordinate and sine is the y-coordinate.
2. Determine x and y signs in the quadrant.
3. State cosine and sine signs.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Sign patterns from tangent-only mnemonics if sine/cosine signs are wrong.