Find, to the nearest tenth of a degree, all values of x in the interval 0≤x≤360 that satisfy the equation.

tan x=cos x

also solve for x in the interval 0≤x≤2π

cos ½x= cos x

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- Apr 6th 2008, 06:23 PM~berserkTrig Equations with Multiple Trig Functions cont.
Find, to the nearest tenth of a degree, all values of x in the interval 0≤x≤360 that satisfy the equation.

tan x=cos x

also solve for x in the interval 0≤x≤2π

cos ½x= cos x - Apr 7th 2008, 02:39 AMjanvdl

Solve for x. (Let Sin x = k and solve using the quadratic formula.)

This is true where x is 0 and there also seems to be a solution between 45 and 60 degrees, as well as between 15 and 30 degrees. I suggest you draw an accurate graph to find the points. - Apr 7th 2008, 09:41 AMMathstud28for the second one I suggest doing it this way
...now using the identity for you obtain ...now by squaring each side and simplifying you get Define u and solve by quadratic formula

- Apr 7th 2008, 06:43 PM~berserk
i think i messed up the second problem yesterday because I did it and solved it like this

http://i182.photobucket.com/albums/x...serk02/eqn.jpg

- Apr 7th 2008, 06:50 PMMathstud28