Question 882545
{{{sin(a+b+c)=sin(a+b)cos(c)+cos(a+b)sin(c)}}}
{{{sin(a+b+c)=(sin(a)cos(b)+cos(a)sin(b))cos(c)+(cos(a)cos(b)-sin(a)sin(b))sin(c)}}}
{{{sin(a+b+c)=sin(a)cos(b)cos(c)+cos(a)sin(b)cos(c)+cos(a)cos(b)sin(c)-sin(a)sin(b)sin(c)}}}