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Math Help - help on calculus

  1. #1
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    help on calculus

    Hi all, wondering if one of you kind souls could look at 1c on this site and help teach me why it is the answer that it is...


    the question
    http://www.math.washington.edu/~m124...1_nichifor.pdf

    site with the answer
    http://www.math.washington.edu/~m124...chifor_ans.pdf
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  2. #2
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    The function is continuous at that point, so all you need to do is substitute in the value of x into the expression.

    -Dan
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  3. #3
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    yea, but i don't understand the math behind arc cos?
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  4. #4
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    Quote Originally Posted by bjorgen View Post
    yea, but i don't understand the math behind arc cos?
    arccos(2/4) means an angle whose cosine is 2/4, or whose cosine is 1/2.
    That angle should be 60 degrees or pi/3 radians.

    arcsin(4/5) is an angle whose sine is 4/5.
    Etc.
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