Aryabhatta contibution in the field of mathematics was not limited to any single field ,but provided a best base for the modern maths to take platform
He gave out studies on trigonometry,algebra,geometry,discovered zero and lot of stuff , can be listed as under..
Aryabhata also wrote the Arya Siddhanta, which is now lost. Aryabhata's contributions include:
1।Trigonometry:
b.Defined the sine (jya) as the modern relationship between half an angle and half a chord
c.Defined the cosine (kojya)
d.Defined the versine (utkrama-jya)
e.Defined the inverse sine (otkram jya)
f.Gave methods of calculating their approximate numerical values
g.Contains the earliest tables of sine, cosine and versine values, in 3।75° intervals from 0° to 90°, to 4 decimal places
h.Contains the trigonometric formula
sin (n + 1) x - sin nx = sin nx - sin (n - 1) x - (1/225)sin nx
i.Spherical trigonometry
a.Continued fractions।
a.Solutions of simultaneous quadratic equations
b.Whole number solutions of linear equations by a method equivalent to modern method
a.Proposed for the first time, a heliocentric solar system with the planets spinning on their axes and following an elliptical orbit around the Sun
a.solar eclipse.
b.Lunar eclipse.
a.In the course of developing a precise mapping of the lunar eclipse, Aryabhatta was obliged to introduce the concept of infinitesimals (tatkalika gati) to designate the near instantaneous motion of the moon.
10.Differential equations:
a. He expressed the near instantaneous motion of the moon in the form of a basic differential equation.
He used the exponential function e in his differential equation of the near instantaneous motion of the moon
Thus he not only worked for the global mathematics but also for the universal mathematics

