The value of the expression $(\sqrt 3\sin 75^{\large\circ}-\cos 75^{\large\circ})$ is

Question

$\begin{array}{1 1}(a)\;2\sin 15^{\large\circ}&(b)\;1+\sqrt 3\\(c)\;2\sin 105^{\large\circ}&(d)\;\sqrt 2\end{array}$