Question

what does two national anthems of south Africa symbolizes​

Answer 1

The South African national anthem is often referred to by its incipit of "Nkosi Sikelel' iAfrika", but this has never been its official title, which is simply "National anthem of South Africa".

Answer 2

The official anthem was Die Stem, in English The Call of South Africa. The unofficial anthem, Nkosi Sikelel' iAfrika, was a symbol of independence and resistance to apartheid, sung by the majority of the population and at all anti-apartheid rallies and gatherings.

To symbolize the equality of blacks and whites, two national anthems were sung on the day of the inauguration. One was sung by the whites and the other by the blacks.