What is the total number of different types of unit cells present in triclinic crystal system?

Calculate the $[\mathrm{OH}]$ if pOH of solution is 4.94

The Solution set of the equation $\sin ^2 \theta-\cos \theta=\frac{1}{4}$ in the interval $[0,2 \pi]$ is

If the points $(1,-1, \lambda)$ and $(-3,0,1)$ are equidistant from the plane $3 x-4 y-12 z+13=0$, then the sum of all possible values of $\lambda$ is