Aryabhata was the first Indian astronomer to develop the concept of the sine function, which he called the jya.

The sine of 30 degrees is 0.5.

The cosine of 45 degrees is 0.707.

The tangent of 60 degrees is 1.732.

Brahmagupta was the first Indian astronomer to develop the concept of the versine function, which he called the koti-jya.

The versine of 30 degrees is 0.5.

The haversine of 45 degrees is 0.25.

Bhaskara II was the first Indian astronomer to develop the concept of the exsecant function, which he called the koti-jyottama.

The exsecant of 30 degrees is 2.

The cosecant of 45 degrees is 1.414.

Bhaskara II was the first Indian astronomer to develop the concept of the cotangent function, which he called the koti-sparsa.

The cotangent of 30 degrees is 1.732.

The arc sine of 0.5 is 30 degrees.

The arc cosine of 0.707 is 45 degrees.

The arc tangent of 1 is 45 degrees.