SOLUTION: find the value of cos 105 degrees without using a calculator.retain radical notation.

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Question 231699: find the value of cos 105 degrees without using a calculator.retain radical notation.
Answer by solver91311(16868) About Me  (Show Source):
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Simplification of this expression is left as an exercise for the student.

Sanity check: Notice that the left hand term is smaller than the right hand term. That means that cos(105) < 0, which makes sense for a Quadrant II angle.

John