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JoannaBlackwelder

  • one year ago

cos(cos^-1(-3/7)-tan^-1(-12/5)) Any help on finding the exact value of this expression would be greatly appreciated! Thanks!

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  1. freckles
    • one year ago
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    well first do you remember that cos(a-b)=cos(a)cos(b)+sin(a)sin(b) ?

  2. JoannaBlackwelder
    • one year ago
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    Ah, gotcha! I was just thinking about that!

  3. freckles
    • one year ago
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    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

  4. freckles
    • one year ago
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    let me know if you need anymore help

  5. JoannaBlackwelder
    • one year ago
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    Got it, thanks!

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