Aryabhata, a renowned Indian mathematician and astronomer, is widely regarded as the pioneer of the decimal system. His work, Aryabhatiya, written in the 5th century CE, introduced the decimal system and the concept of zero.

In the Indian numeral system, the symbol for zero is a small circle, often represented as a dot. This symbol was first used by Indian mathematicians in the 6th century CE.

Brahmagupta, a prominent Indian mathematician and astronomer, is credited with developing the concept of negative numbers in the 7th century CE. He also developed rules for performing arithmetic operations with negative numbers.

In the Indian numeral system, the mathematical symbol for the square root is a small square root sign, similar to the one used in modern mathematics.

Aryabhata, the renowned Indian mathematician and astronomer, is credited with developing the concept of the sine function in the 5th century CE. He also developed formulas for calculating the sine of various angles.

In the Indian numeral system, the mathematical symbol for the cosine function is a small letter 'c' with a dot above it.

Bhaskara II, a renowned Indian mathematician and astronomer, is credited with developing the concept of the tangent function in the 12th century CE. He also developed formulas for calculating the tangent of various angles.

In the Indian numeral system, the mathematical symbol for the cotangent function is a small letter 'c' with a line above it.

Brahmagupta, the prominent Indian mathematician and astronomer, is credited with developing the concept of the secant function in the 7th century CE. He also developed formulas for calculating the secant of various angles.

In the Indian numeral system, the mathematical symbol for the cosecant function is a small letter 'c' with a small circle above it.

Bhaskara II, the renowned Indian mathematician and astronomer, is credited with developing the concept of the versine function in the 12th century CE. He also developed formulas for calculating the versine of various angles.

In the Indian numeral system, the mathematical symbol for the haversine function is a small letter 'h' with a small circle above it.

Brahmagupta, the prominent Indian mathematician and astronomer, is credited with developing the concept of the exsecant function in the 7th century CE. He also developed formulas for calculating the exsecant of various angles.

In the Indian numeral system, the mathematical symbol for the excosecant function is a small letter 'e' with a small circle above it.

Brahmagupta, the prominent Indian mathematician and astronomer, is credited with developing the concept of the chord function in the 7th century CE. He also developed formulas for calculating the chord of various angles.