The Sulba Sutras, a collection of ancient Indian mathematical texts, contain the earliest known references to the sine function, dating back to around 800-500 BCE.

Aryabhata, a renowned Indian mathematician and astronomer, is credited with introducing the concept of the tangent function in his work, the Aryabhatiya, written in the 5th century CE.

Bhaskara II, also known as Bhaskaracharya, made significant contributions to trigonometry, including the development of trigonometric identities and formulas.

The Indian contributions to trigonometry played a crucial role in the development of astronomy, enabling accurate calculations of planetary positions, facilitating the study of celestial bodies and their movements, and improving the understanding of the Earth's rotation and orbit.

The Indian concept of the sine function laid the foundation for the modern definition of sine in terms of a right triangle, provided a geometric interpretation of the sine function, and enabled the development of trigonometric tables.

Indian trigonometric knowledge played a significant role in architecture, enabling precise calculations for constructing temples and other structures, facilitating the design of intricate geometric patterns and motifs, and helping determine the orientation of buildings according to astronomical principles.

Indian contributions to trigonometry had a profound impact on navigation and surveying, enabling accurate calculations of distances and angles for seafaring, facilitating the creation of maps and charts for navigation, and helping determine the latitude and longitude of locations.

The Sulba Sutras, a collection of ancient Indian mathematical texts, contain the earliest known references to the cosine function, dating back to around 800-500 BCE.

Aryabhata, a renowned Indian mathematician and astronomer, is credited with introducing the concept of the secant function in his work, the Aryabhatiya, written in the 5th century CE.

Madhava of Sangamagrama, a renowned Indian mathematician and astronomer, made significant contributions to trigonometry, including the development of trigonometric series and the discovery of the Taylor series expansion of trigonometric functions.

The Indian contributions to trigonometry provided a foundation for the development of differential and integral calculus, enabled the study of rates of change and limits, and facilitated the development of techniques for solving complex mathematical problems.

The Indian concept of the tangent function laid the foundation for the modern definition of tangent in terms of a right triangle, provided a geometric interpretation of the tangent function, and enabled the development of trigonometric tables.

Indian trigonometric knowledge played a significant role in music, enabling the creation of musical scales and harmonies, facilitating the study of musical intervals and their relationships, and helping determine the frequencies of musical notes.

Indian contributions to trigonometry had a profound impact on astronomy and astrology, enabling accurate calculations of planetary positions and movements, facilitating the prediction of eclipses and other celestial events, and helping determine the dates of religious festivals and auspicious occasions.