let f(x)= (sinx) / x , from 0 which is less than x which is less than or equal to pi

1, when x = 0

show that xf(x) = sinx , for 0 which is less than or equal to x which is less than or equal to pi

i multiplied both sinx/x by x and got sinx for 0<x<(less than or equal to) pi

and multiplied 1 * x = x which gives me 0 when x=0.

is that right because i'm unsure if the question also wants it to be continuous

also the second question says that find the volume of the solid generated by revolving f(x) about the y-axis.

how am i supposed to calculate that if f(x) is divided into 2 parts