Terms for subject Mathematics containing at once

English	Russian
it can be obtained at once by differentiation	может быть получено непосредственно дифференцированием
it is at once apparent	с первого взгляда очевидно
this was at once a ... and a	одновременно и ... , и
this was at once a ... and a	одновременно и, и
whenever we see that an object suddenly begins to move, we assume at once that	когда бы ни