Find an exact value.

sine of negative eleven pi divided by twelve.

Question

Find an exact value. 

sine of negative eleven pi divided by twelve.

anonymous · Answer

use your calculator. 
Make sure your mode is set to radians
sin(-11pi/12)=
-0.2588

anonymous · Answer

no the answers not supposed to be a decimal

nnesha · Answer

addition formula 
divide 11pi/12 into two fraction 
both should be on the unit circle so we can use  $$\rm \sin(x \pm y)=sinx *\cos y \pm \cos x* siny$$

nnesha · Answer

what two radian on the unit circle would you add or subtract to get 11pi/12 ??

anonymous · Answer

I don't know what to do with that

anonymous · Answer

Um let me think

anonymous · Answer

2pi/3 and pi/4?

nnesha · Answer

correct now use the that formula

anonymous · Answer

do i use the addition or subtration sign?

nnesha · Answer

you would add 2pi/3 +pi/4 to get 11pi/12 so addition

anonymous · Answer

i plugged it in but whats the next step?

anonymous · Answer

oh wait i think i know

nnesha · Answer

okay :=)) try it post ur work i'll check it ot

anonymous · Answer

would it be$$(\sqrt{6}-\sqrt{2})/4$$

nnesha · Answer

what is sin 2pi/3 ??

anonymous · Answer

$$\sqrt{3}/2$$

nnesha · Answer

right your answer is correct !

anonymous · Answer

thank youuuuu

nnesha · Answer

np :=))