Question

find the exact value of cos(11pi/12)

Answer 1

-0.96592582628906828674974319972889736763390483900840

Answer 2

i need the exact answer, not the decimal equivalent

Answer 3

\[-\frac{ 1+\sqrt{3} }{ 2\sqrt{2} }\]

Answer 4

cos(11pi/12)=cos(pi -pi/12)=-cos(pi)/12=-cos(pi/4 -pi/3)
use cos(a-b)=cosacosb +sinasinb
thus cos(11pi/12)=-(sqrt(3)+1)/(2*sqrt(2)) now using calculator u can get ur desired results