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gjhfdfg

  • one year ago

Finding the exact value of trig. functions?

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  1. gjhfdfg
    • one year ago
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    I have this I'm trying to figure out, \[\cot (- \frac{ 5 \pi }{ 4 } )\]

  2. Marx
    • one year ago
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    it's \[\cot(-\frac{5}{4}\pi) = \frac{\cos(-\frac{5}{4}\pi)}{\sin(-\frac{5}{4}\pi)}\] can you find those?

  3. gjhfdfg
    • one year ago
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    Wouldnt it just cancel out?

  4. Marx
    • one year ago
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    if by cancel out you mean will give -1 , then yeah :) remember : cos(-x) =cosx

  5. gjhfdfg
    • one year ago
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    Nope thats not what I meant lol But thanks

  6. Marx
    • one year ago
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    yeah I figured that, my point was that \[\cos(-\frac{5}{4}\pi)=\cos(\frac{5}{4}\pi)=\frac{1}{\sqrt{2}}\] and \[\sin(-\frac{5}{4}\pi)=-\frac{1}{\sqrt{2}}\]

  7. gjhfdfg
    • one year ago
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    I was thinking that the - 5/4 pi cancels out for some reason

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