Solve the trigonometric equation 2 cos(theta) - 1 = 0

Question

anonymous · Answer

*In a [0, 2pi] interval]

anonymous · Answer

cos theta = 1/2... you really need to memorize the unit circle. you will use it A LOT

answer is 60* degrees or pi/3

anonymous · Answer

so k * pi/3

anonymous · Answer

60, 120, 180, 240

anonymous · Answer

http://www.youtube.com/watch?v=1-hrT1Ys390 watch this... it's an easy trick to memorize the first quadrant stuff http://www.youtube.com/watch?v=cIVpemcoAlY use this to figure everything else out after you use the first trick

anonymous · Answer

telling you though, if you plan on moving into cal 1, cal 2, cal3 etc. the faster you memorize the unit circle and are able to quickly pull the numbers out of your head, the better. you will use it in just about every single calculus problem

anonymous · Answer

HELP? please!

anonymous · Answer

will some one please help me out?

anonymous · Answer

Yeah you're right about memorizing it. I'm trying to get it but it's coming along slower than I expected. Thanks for your help though.