Aryabhata is widely regarded as one of the greatest Indian mathematicians of all time. He lived in the 5th century CE and made significant contributions to astronomy, mathematics, and trigonometry.

Brahmagupta is known for his work on the Brahmagupta theorem, which states that in a cyclic quadrilateral, the sum of the products of the opposite sides is equal to the product of the diagonals.

Aryabhata is credited with developing the concept of the sine function. He also developed a table of sines, which was used for astronomical calculations.

Bhaskara II is known for his work on the Fibonacci sequence. He discovered the recurrence relation for the Fibonacci sequence and also provided a geometric interpretation of the sequence.

Aryabhata is considered to be the father of Indian mathematics. He made significant contributions to astronomy, mathematics, and trigonometry, and his work had a profound influence on the development of mathematics in India.

Bhaskara II is known for his work on the Pascal's triangle. He discovered the properties of the Pascal's triangle and used it to solve various mathematical problems.

Aryabhata is credited with developing the concept of the cosine function. He also developed a table of cosines, which was used for astronomical calculations.

Brahmagupta is known for his work on the Pythagorean theorem. He provided a geometric proof of the Pythagorean theorem and also developed a formula for calculating the hypotenuse of a right triangle.

Bhaskara II is considered to be the greatest Indian mathematician of the 12th century. He made significant contributions to astronomy, mathematics, and trigonometry, and his work had a profound influence on the development of mathematics in India.

Bhaskara II is known for his work on the binomial theorem. He discovered the general formula for the binomial theorem and also provided a geometric interpretation of the theorem.

Aryabhata is credited with developing the concept of the tangent function. He also developed a table of tangents, which was used for astronomical calculations.

Brahmagupta is known for his work on the area of a triangle. He developed a formula for calculating the area of a triangle using its sides.

Srinivasa Ramanujan is considered to be the greatest Indian mathematician of the 16th century. He made significant contributions to number theory, analysis, and combinatorics, and his work had a profound influence on the development of mathematics in the 20th century.

Brahmagupta is known for his work on the volume of a sphere. He developed a formula for calculating the volume of a sphere using its radius.

Aryabhata is credited with developing the concept of the secant function. He also developed a table of secants, which was used for astronomical calculations.