Question 870533
{{{sin(a+b)=sin(a)cos(b)+cos(a)sin(b)}}}
So,
{{{sin(18)cos(12)+cos(18)sin(12)=sin(18+12)}}}
{{{sin(18)cos(12)+cos(18)sin(12)=sin(30)}}}
{{{sin(18)cos(12)+cos(18)sin(12)=0.5}}}