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  1. #1

    Spot my Calculus homework?

    http://yourupload.com/show.php/3828/Picture%20017.jpg

    How do you do # 39? ( I picked a random one )
    I got a test tomorow, can u show me the steps?

    pretty pweeez

  2. #2
    Join Date
    Dec 2003
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    Fairfax, Virginia
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    I haven't done calculus yet, but do you have a graphing calculator, like a TI-83 or something? Just stick it in there. That's what a calculator is for. Okay, I guess this is the easy way and defeats the whole purpose, but are you going to be allowed to use calculators on your test?

  3. #3
    That's not how it works, you cant put in the Principal value of Cosine nor
    Sine into the calculator

  4. #4
    Join Date
    Dec 2003
    Location
    Fairfax, Virginia
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    Originally posted by phaz
    That's not how it works, you cant put in the Principal value of Cosine nor
    Sine into the calculator
    I hadn't even known what a "principal value" was until I just read up on it -- and I still don't fully understand it. Perhaps that's because I haven't had calculus class yet (will have it in another two years) and don't know even a bit of it.

  5. #5
    Join Date
    Jan 2005
    Location
    Kennesaw, GA
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    1,033
    Offhand I don't recall any special formulas for this kind of problem. It is basically as SniperDevil said, although if you could do it without a calculator that might be better.

    First you need to find the values of arccos (-1/2) and arcsin 2. In other words, the cosine of what angle equals -1/2 and the sine of what angle equals 2?

    Well, the cosine of 120 degrees equals -1/2. But the sine of all angles must be between 0 and 1, so there is no angle for which the sine is 2.

    So, as far as I can tell, this problem has no answer.

    I hope that helps.

  6. #6
    Join Date
    Oct 2003
    Location
    Georgetown, Ontario
    Posts
    1,761
    Should have asked a discrete math question. I'd be able to help you with that.
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  7. #7
    Join Date
    Dec 2002
    Posts
    130
    Do your own danged homework.

  8. #8
    Join Date
    Jun 2004
    Location
    Boise, ID U.S.A.
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    3,503
    It's been so long since I have done these kinds of problems, that I don't remember how. However, I am pretty sure that this is trigonometry and not calculus. I don't see any integrals or derivatives here.

  9. #9
    Join Date
    Feb 2005
    Location
    Northern VA
    Posts
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    arcsin(2) is meaningless. See
    http://oakroadsystems.com/twt/inverse.htm

    The others aren't too hard.
    Rich
    WebsiteMaven - Web Hosting Reviews, Guides, and Advice to Build and Promote your Web Site

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