ksaimouli
  • ksaimouli
3cosx+9=7 slove for x saifoooo help
Mathematics
chestercat
  • chestercat
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ksaimouli
  • ksaimouli
131.8 another one
ksaimouli
  • ksaimouli
plx 73 plz
anonymous
  • anonymous
\[\color{red}{x}\color{blue}{\text{saifoo}}=\cos^{-1}(-\frac{2}{3})\]

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myininaya
  • myininaya
I told you how to get the solutions \[x=\cos^{-1}(\frac{-2}{3})+2n \pi\] Please ask me what you don't understand about how I got this? by the way n is an integer
anonymous
  • anonymous
looks like 131.8 degrees if you are working in degrees
anonymous
  • anonymous
hello myininaya!
myininaya
  • myininaya
if you want degrees do +360 n
myininaya
  • myininaya
and put your calc in degree mode for approximations
myininaya
  • myininaya
hey sat
ksaimouli
  • ksaimouli
how to get 228.19
anonymous
  • anonymous
i am making truth tables. nothing could be more boring, but i have to do it t t t f f t f f arrghhh
ksaimouli
  • ksaimouli
is i have to add 180 hhhhhhhhhh i dont know plz help
anonymous
  • anonymous
subtract 131.8 from 360
anonymous
  • anonymous
let me draw a picture
ksaimouli
  • ksaimouli
ok
anonymous
  • anonymous
|dw:1326938616923:dw|
myininaya
  • myininaya
cos(x)=cos(-x)
anonymous
  • anonymous
both those places on the circle have the same first coordinate, that is the same cosine. the first one you can get from the calculator, it is131.8 the other one you get from subtracting 131.8 from 360
myininaya
  • myininaya
\[\cos(131.8)=\cos(-131.8)=\cos(-131.8+360)\]
anonymous
  • anonymous
@myininaya is that a five o-clock shadow you're sporting?
ksaimouli
  • ksaimouli
ok thx so ican sub 360 for everythink like thses problems

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