Ask Me Help Desk

Ask Me Help Desk (https://www.askmehelpdesk.com/forum.php)
-   Mathematics (https://www.askmehelpdesk.com/forumdisplay.php?f=199)
-   -   sec(2x)=3cos(2x)+cos(90^0 - 2x), find x (https://www.askmehelpdesk.com/showthread.php?t=729272)

  • Jan 20, 2013, 11:00 PM
    handi
    sec(2x)=3cos(2x)+cos(90^0 - 2x), find x
    solve the following equation in the given interval : sec
  • Jan 22, 2013, 08:02 AM
    ebaines
    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).

    • All times are GMT -7. The time now is 07:49 PM.