anonymous
  • anonymous
Use even and odd properties of the trigometric function to find the exact value of the cos (-150 degrees) what are the steps for this?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
no i dont
zzr0ck3r
  • zzr0ck3r
hmm well its even so cos(-x) = cos(x)
zzr0ck3r
  • zzr0ck3r
do you know cos(150)?

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zzr0ck3r
  • zzr0ck3r
this should be given on a unit circle
anonymous
  • anonymous
no. all i had was cos(-150) cos 150 degrees
anonymous
  • anonymous
but i dont know where to go from here
zzr0ck3r
  • zzr0ck3r
well this is just a angle you should have memorized
zzr0ck3r
  • zzr0ck3r
-sqrt(3)/2
anonymous
  • anonymous
what angle i should memorize?
zzr0ck3r
  • zzr0ck3r
30 45 60 90 120 135 180 210 225 240 270 300 315 330
zzr0ck3r
  • zzr0ck3r
you will notice that out of all these angles then numbers that go with them are 0,1,sqrt(2)/2,1/2, and sqrt(3)/2
zzr0ck3r
  • zzr0ck3r
so its not as bad as it looks, really if you get the first 4, the other are easy...
anonymous
  • anonymous
Ohhhhh i see what you mean.. learn them.
zzr0ck3r
  • zzr0ck3r
memorise them
anonymous
  • anonymous
i will make sure learn em*
zzr0ck3r
  • zzr0ck3r
http://www.youtube.com/watch?v=OBmhgiLi77k
zzr0ck3r
  • zzr0ck3r
this will make it easy

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