JoannaBlackwelder
  • JoannaBlackwelder
cos(cos^-1(-3/7)-tan^-1(-12/5)) Any help on finding the exact value of this expression would be greatly appreciated! Thanks!
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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freckles
  • freckles
well first do you remember that cos(a-b)=cos(a)cos(b)+sin(a)sin(b) ?
JoannaBlackwelder
  • JoannaBlackwelder
Ah, gotcha! I was just thinking about that!
freckles
  • freckles
let a=arccos(3/7) and b=arctan(-12/5) so cos(a)=3/7 and tan(b)=-12/5 draw two separate right triangles

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freckles
  • freckles
let me know if you need anymore help
JoannaBlackwelder
  • JoannaBlackwelder
Got it, thanks!

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