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    stupidchapter6's Avatar
    stupidchapter6 Posts: 2, Reputation: 1
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    #1

    Feb 9, 2008, 09:06 PM
    precalc probz
    sin(cos x)=(square root 2)/ 2
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Feb 11, 2008, 10:35 AM
    Start by considering the equation sin(A) = sqtr(2)/2. Can you solve that for A? Then you would have A = cos(x), which means x = arc cos (A).
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