kymber
  • kymber
Can you explain this to me? I don't understand the cos to the negative first power. Problem attached
Mathematics
  • Stacey Warren - Expert brainly.com
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schrodinger
  • schrodinger
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kymber
  • kymber
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lgbasallote
  • lgbasallote
it means arc cosine...it was used to cancel the cos(T) because the arc cosine-ing a cosine cancels the cosine...and you need to cancel it to isolate T. oh i hope my explanation is clear :(
anonymous
  • anonymous
that means arccos which is an angle

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kymber
  • kymber
Yeah, I know it was used to cancel it out, but I don't understand how they got the answer. :p
lgbasallote
  • lgbasallote
arc cosine of -(0.1278) it was inputted in a scientific calculator
anonymous
  • anonymous
calculator has a \[\cos^{-1}\] button
anonymous
  • anonymous
like tan(pi/4) =1 when you take arctan of tan see on right side you will get arctan(1) which is pi/4
anonymous
  • anonymous
just don't confuse \[\cos^{-1}\] with \[\frac{1}{\cos}\] They are not the same
kymber
  • kymber
Oooh. I don't think my calculator has that button. I thought you had to like work it out
kymber
  • kymber
So I can't do this unless I have a special calculator?
anonymous
  • anonymous
there is a buttom
kymber
  • kymber
I think i have a special calculator in the drawer in my bathroom. I'mma go check
anonymous
  • anonymous
you can also type arccos(-0.1278) into google
anonymous
  • anonymous
button
anonymous
  • anonymous
that will give you the answer in radians though, so multiply google's answer by 180/pi
lgbasallote
  • lgbasallote
normally it's shift + cos
lgbasallote
  • lgbasallote
in scientific calculators
kymber
  • kymber
I didn't find it. :( But I'm sure there's an online calculator that'll work! Anways thanks guys! :]
anonymous
  • anonymous
@Dockworker You can also add the words "in degrees" at the end.
anonymous
  • anonymous
oh cool, didn't know that
kymber
  • kymber
Google is such fabulous website
anonymous
  • anonymous
Google scares me sometimes with what it can do.
kymber
  • kymber
Haha! :D

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