Question: If sin >0 and cos <0, what quadrant is in? If the reference angle is 4040 give two possible values for . If we know

  1. If sin>0 and cos<0, what quadrant is in? If the reference angle is 4040 give two possible values for .
  2. If we know thatcos=3/5, what are the possible values ofsin? What does the quadrant have to do with the values ofsin?
  3. Trigonometry is and has been widely used in navigation, including during the eighteenth century. Any thoughts on why an eighteenth century sailor (including pirates) would need to use trigonometry?

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