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    aderet's Avatar
    aderet Posts: 1, Reputation: 1
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    #1

    Nov 12, 2015, 09:05 PM
    Find cos(x)
    Given: cos2x=(-5/12) and x is less than pi but greater than (pi/2)
    smoothy's Avatar
    smoothy Posts: 25,490, Reputation: 2853
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    #2

    Nov 12, 2015, 09:24 PM
    Since this is your homework and not ours. What do you think the answer was and how did you arrive at it.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Nov 13, 2015, 06:42 AM
    Hint: if you replace 2x with another variable, say w, then you have:

    , and .

    Now, can you solve for w?
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