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How do you do #9? Ignore the rest of the problems

How do you do #9? Ignore the rest of the problems
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2 votes
How do you do #9? Ignore the rest of the problems

How do you do #9? Ignore the rest of the problems-example-1
asked
User NeARAZ
by
8.0k points

1 Answer

4 votes

Explanation:

cos (105) = cos( 60 + 45) = cos 60 cos 45 - sin60 sin45

= 1/2 * sqrt (2) /2 - sqrt(3)/2 * sqrt (2)/2

= sqrt (2)/4 - sqrt(6)/4

= 1/4 (sqrt(2) - sqrt (6) )

answered
User Jonathan Wilbur
by
8.1k points
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