The value of $\cot\left(\cos^{-1}\frac{7}{25}\right)$ is

The value of $\frac{1}{AB^2} + \frac{1}{BC^2}$ is:

$\angle ABC$ is equal to:

The value of $\tan^{-1}(1) + \cos^{-1}\left(-\frac{\sqrt{3}}{2}\right) + \sin^{-1}\left(\frac{1}{2}\right)$ is

$\cos[\tan^{-1}\{\sin(\cot^{-1}x)\}]$ is equal to

The minimum value of the function $f(x) = 3\sin x - 4\cos x, x \in [-4\pi, 4\pi]$ is equal to

The simplest form of $\tan^{-1} \frac{\sqrt{1+x^2} - 1}{x}$, $x \neq 0$ is: