Question

find exact values of cosx where -pi 13 years ago

Answer 1

is that the complete question? is there anything more to the problem?

Answer 2

cosx will be a number between -1 and 1 given those x values....

Answer 3

sorry theres more thats exact values of cosx sqrt3/2

Answer 4

again exact values of x where cosxsqrt3/2

Answer 5

so the question is to solve the equation: \(\large cosx=\frac{\sqrt3}{2} \), where \(\large -\pi < x \le \pi \)
???

Answer 6

yes

Answer 7

since cos x is positive, your angle will come from the first and fourth quadrants....
remembering the unit circle, what cosine of what angle will give you sqrt3/2 ?

Answer 8

is it 60 degrees

Answer 9

not quite... check out page 3 here....
http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet.pdf

Answer 10

remember, cosine is your x coordinate.....

Answer 11

is it 90 degress

Answer 12

no.... try again.... it's in the first quadrant... which angle has sqrt3/2 as it's x coordinate?

Answer 13

30 degrees

Answer 14

yes.... 30 degrees but you really should answer according to what the question asked... so your angle is pi/6...

Answer 15

now, look at the fourth quadrant.... there's another angle that has sqrt3/2 as its x coordinate... what angle is that?

Answer 16

are there any other values that should be entered for this question

Answer 17

yes, that what my question above is about...

Answer 18

is it 11pi/6

Answer 19

good!!!

Answer 20

but that's not the answer they want....

Answer 21

they want an answer between -pi and pi

Answer 22

thanks im definitely a big fan,

Answer 23

you need to come up with an angle between -pi and pi that is coterminal with 11pi/6...
can you tell me what angle that is?

Answer 24

i,m not sure of that