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Thread: extra credit

  1. March 30th 2009, 03:05 PM #1
    lazyboy292
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    extra credit

    why does arcsin(2x) + arccos(x) = PI / 6?

    our teacher wants us to show this using identities, not literally finding a solution for (x)
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  2. March 30th 2009, 03:15 PM #2
    Plato
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    Quote Originally Posted by lazyboy292 View Post
    why does arcsin(2x) + arccos(x) = PI / 6?
    our teacher wants us to show this using identities, not literally finding a solution for (x)
    Does your screen name tell you something?
    What have you tried?
    Show some effort on your part!
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  3. March 30th 2009, 03:37 PM #3
    lazyboy292
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    arcsin 2x = PI/6 - arccos x
    2x = sin(PI/6 - arccos x)
    thats all ive gotten so far
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  4. March 30th 2009, 10:10 PM #4
    mr fantastic
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    Quote Originally Posted by lazyboy292 View Post
    arcsin 2x = PI/6 - arccos x
    2x = sin(PI/6 - arccos x)
    thats all ive gotten so far
    If this is for extra credit then I think you should be handing in your own work, not the work of others.

    Thread closed.
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