Question

find the value of sin 67 1 /2 degree​

Answer 1

Step-by-step explanation:

cos s/2=+-sqrt((1+cos s)/2), (note:+ or - answer depends on value of cos s/2 not cos s.) tan s/2=sin s/(1+cos s) sin 67.5=sin 135/2=sqrt((1-cos 135)/2) =sqrt((1+√2/2)/2)=sqrt((2+√2)/4) =sqrt(2+√2)/2