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

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 Click here to see ALL problems on Equations Question 231699: find the value of cos 105 degrees without using a calculator.retain radical notation.Answer by solver91311(16868)   (Show Source): You can put this solution on YOUR website! 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