Aryabhata is considered the father of Indian trigonometry due to his contributions to the field in the 5th century AD.

In Indian trigonometry, the value of (\sin 90^\circ) is 1.

In Indian trigonometry, the value of (\cos 0^\circ) is 1.

In Indian trigonometry, the value of (\tan 45^\circ) is 1.

Aryabhata developed the concept of the sine table in the 5th century AD.

Bhaskara II developed the concept of the cosine table in the 12th century AD.

Brahmagupta developed the concept of the tangent table in the 7th century AD.

Madhava of Sangamagrama developed the concept of the cotangent table in the 14th century AD.

Madhava of Sangamagrama developed the concept of the secant table in the 14th century AD.

Madhava of Sangamagrama developed the concept of the cosecant table in the 14th century AD.

Madhava of Sangamagrama developed the concept of the versine table in the 14th century AD.

Madhava of Sangamagrama developed the concept of the haversine table in the 14th century AD.

Madhava of Sangamagrama developed the concept of the exsecant table in the 14th century AD.

Madhava of Sangamagrama developed the concept of the excosecant table in the 14th century AD.

Madhava of Sangamagrama developed the concept of the chord table in the 14th century AD.