Thanks for link, Calculus was not discovered but developed,  I did not know of Bhaskara contribution,a more balanced view is expressed by David Joyce, Professor of Mathematics at Clark University:
Different people developed different parts of that part of mathematics now called calculus at different times and at different places. Some of them knew nothing about the others. Most of the things Leibniz and Newton did were known before them, but some things were new with them ..... The idea of summing small differences to get the total difference is the essence of the fundamental theorem of calculus. Bhaskara had it in India, but so did Aryabhata long before him, and so did Archimedes. The formalization of this idea took over 2000 years. Archimedes didn’t see his methods as completely justified, so proved them again using rigorous geometry. Although Oresme, Newton, and Leibniz gave more complete justifications, it wasn’t until the 1800s that calculus had a good foundation.