SOLUTION: 4sec(180)-2sin^(2)(270) Don't know where to start? Maybe convert sec to 1/cos180? example: 4(1/cos180)-2sin^2(270) ???

Question 488194: 4sec(180)-2sin^(2)(270)
Don't know where to start?
Maybe convert sec to 1/cos180?
example: 4(1/cos180)-2sin^2(270) ???
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
4sec(180)-2sin^(2)(270)
**
Using your suggestion, which is a good one.
4(1/cos180)-2sin^2(270)
sin 270�=-1
sin^2(270)=1
2sin^2(270)=2
..
cos 180�=-1
1/cos180=-1
4(1/cos180)=-4
..
4(1/cos180)-2sin^2(270)=-4-2=-6
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