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

    Jan 20, 2013, 11:00 PM
    sec(2x)=3cos(2x)+cos(90^0 - 2x), find x
    solve the following equation in the given interval : sec
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Jan 22, 2013, 08:02 AM
    Hint: start by converting the sec(2x) to 1/cos(2x), and the cos(90-2x) to sin(2x). Then I suggest put the sin(2x) term into sqrt(1-cos^2(2x)), rearrange and solve for cos(2x).
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