$\sin^2 \large\frac{\pi}{4} + \normalsize \cos^2 \large\frac{\pi}{3}-$$2 \tan^2 \large\frac{\pi}{3}$ is

Question

$\begin{array}{1 1} (a)\;\large\frac{21}{4} \\ (b)\;\large\frac{-21}{4} \\ (c)\;\large\frac{21}{2} \\ (d) \;\large\frac{-21}{2}\end{array}$