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Trig, What would this reduce to?

  • #1
TheRedDevil18
405
1

Homework Statement



cos(-225)

The Attempt at a Solution



Would it become, -cos45 ?
Just want to make sure.
 

Answers and Replies

  • #2
HallsofIvy
Science Advisor
Homework Helper
41,770
911
Are we to assume that this is 225 degrees?

If so then 225= 360- 35, NOT 45.
 
  • #3
Mentallic
Homework Helper
3,798
94
TheRedDevil18, you're correct.

HallsofIvy said:
225= 360- 35
That's not right, it's 225 = 360 - 135.
 

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