Who divided the $Angiosperms$ into two classes?

For the combination of logic gates shown in the figure,the equivalent logic gate is

The value of $\sum_{n=0}^{\infty}\left(\frac{2 i}{3}\right)^n$ is

Identify the major product of the following reaction:

The phase difference between input and output voltage of a $CE$ circuit is.......$^o$

The equations of the perpendicular bisectors of sides $AB$ and $AC$ of a $\triangle ABC$ are $x-y+5=0$ and $x+2y=0$ respectively. If the coordinates of vertex $A$ are $(1, -2)$,then the equation of $BC$ is