The value of $\tan^{-1}\left(\frac{\cos\frac{15\pi}{4} - 1}{\sin\frac{\pi}{4}}\right)$ is equal to (1) $-\frac{\pi}{4}$ (2) $-\frac{\pi}{8}$ (3) $-\frac{5\pi}{12}$ (4) $-\frac{4\pi}{9}$
The value of $\tan^{-1}\left(\frac{\cos\frac{15\pi}{4} - 1}{\sin\frac{\pi}{4}}\right)$ is equal to\\
(1) $-\frac{\pi}{4}$\\
(2) $-\frac{\pi}{8}$\\
(3) $-\frac{5\pi}{12}$\\
(4) $-\frac{4\pi}{9}$