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anonymous

  • 5 years ago

Given sin x =-1/2 with x in quadrant 3 and tan y =4/3 with y in quadrant 1, find the exact value of sin(x-y).

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  1. anonymous
    • 5 years ago
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    incomplete info

  2. anonymous
    • 5 years ago
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    thats all the question gives me

  3. anonymous
    • 5 years ago
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    I'm stumped. I don't know if x and y are sides of triangle or angles

  4. anonymous
    • 5 years ago
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    \[actually x=\alpha and y=\beta\]

  5. anonymous
    • 5 years ago
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    can't figure out what you just wrote

  6. anonymous
    • 5 years ago
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    \[x=\alpha \] and \[y=\beta\]

  7. anonymous
    • 5 years ago
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    OK, choice of variables made the question confusing. I got it now. Got to go to class will attempt later.

  8. anonymous
    • 5 years ago
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    okay appreciate it!

  9. anonymous
    • 5 years ago
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    Recall sin (A - B) = Sin A cos B - cos A sin B Use sin A= -1/2 in 3rd quadrant to find cos A Use tan B =4/3 in 1st to find sin of B, cos B Use exact values (no calculator, keep square roots etc) to find above

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spraguer (Moderator)
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