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Modern math has a continuous thread of development from the Greeks &c through the Arabs to Europe and today's math. Indian math (if indeed it did exist as you claim) was independent of this thread, and (with a few exceptions such as the idea of zero & positional notation) seems to have died out without making any contribution to modern math.
It's like claiming that the ancient Egyptian pyramid builders, or the folks who built Stonehenge and other Neolithic monuments, must have known a great deal about engineering. But whatever they did know is lost. Their techniques aren't taught in engineering school.