Question

Precalc question, pic attached

Answer 1

well since you have to expresions and they equal 0, one of them has to be 0 by th multiplication property

a*0=0

anyways set the first equation equal to 0

cosx+1=0
cosx=-1 what values do you get for that?

Answer 2

x=2piN-pi?

Answer 3

huh?

Answer 4

x=2?

Answer 5

not quite .

Answer 6

grr

Answer 7

Do you have a calaculator or uni circle nearby?

Answer 8

yes

Answer 9

unit

Answer 10

Ok well on the unit circle there are x and y values, the x values are the cos and the y the sin of the angle i it

Answer 11

oh i have a calculator but ok...

Answer 12

x=cos and y= sin

Answer 13

Ok first off i find it hlpful to memeorize the unit circle http://www.google.com/imgres?imgurl=http://www.mathsisfun.com/geometry/images/circle-unit-304560.gif&imgrefurl=http://www.mathsisfun.com/geometry/unit-circle.html&h=279&w=366&sz=13&tbnid=_6Om16JZLkXUaM:&tbnh=90&tbnw=118&zoom=1&usg=__CqGo36F2KuwkOjsVtdiANgmuWoM=&docid=dJkySTuOBEh4FM&sa=X&ei=5qHjUaqXHMeu4AOjqICwBg&ved=0CDoQ9QEwAw&dur=272

Answer 14

This will be helpful later on in pre-calc but anyways we wont deal with that right now

Answer 15

anyways type in -1 and take the cos^(-1) of that

Answer 16

ok i came up with 2PI/3 while messing with the equation and since thats one of the choices i think ill go with that

Answer 17

thank you for guiding me in the right direction

Answer 18

Nope,

Answer 19

Look at the unit circle, find -1,0 on the circle, it will show you which angle has a cos of -1 and thats pi

Answer 20

There's a lot more to this questio, are you willin to learn?