here is my work so far

where did I go wrong?

 

sin(2α)=sin(120°)=0.866 not 0.0365

 

α is equal to the angle in radians

if α=1.047RAD
then
2α=2.094RAD

no?

 

And the sin of 2.094 rad is 0.866.

Did you put your calculator in radian mode?

 

DOH!


yup definitely forgot radian mode

thanks