2 sin100 cos 100
any suggestion? thanks in advance
Dear alessandromangione,
$\displaystyle 2sin\theta\cos\theta=sin2\theta$
Therefore,
$\displaystyle 2sin100^{o}cos100^{o}=sin(2\times100^{o})=sin200\a pprox-0.3420$
Hope this will help you.
By the way what a big name you have! Can you tell us the meaning of it??