3if u want to chek then put n=0 so option b matches.
errr....just got confused...which one of these is correct??
sin(a) + sin(a+d) + sin(a+2d) + sin(a+3d) + ...... + sin(a+nd) =
\frac{sin\left(\frac{2a+nd}{2}\right)sin\left(\frac{nd}{2} \right)}{sin\left(\frac{d}{2} \right)}
OR
\frac{sin\left(\frac{2a+nd}{2}\right)sin\left(\frac{\left(n+1 \right)d}{2} \right)}{sin\left(\frac{d}{2} \right)} ?
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