Surya Siddhanta
गताद् भुजज्या विषमे गम्यात् कोटिः पदे भवेत्।*युग्मे तु गम्याद् बाहुज्या कोटिज्या तु गताद् भवेत् ॥(C समे)
The sine of the Bhuja (of the arc which terminates) in an odd quadrant (i. e. 1st and 3rd,) is the sine of that part of the given arc which falls in the quadrant where it terminates, but the sine of the Koṭi (of that arc) is the sine of that arc which it wants to complete the quadrant where the given arc ends; and the sine of the Bhuja (of the arc) which ends in an even quadrant (i. e. 2nd and 4th) is the sine of that arc which it wants to complete the quadrant where the given arc ends; but the sine of the Koṭi (of that arc) is the sine of that part of the given arc which falls in that quadrant where it terminates.
english translation
gatAd bhujajyA viSame gamyAt koTiH pade bhavet।*yugme tu gamyAd bAhujyA koTijyA tu gatAd bhavet ॥(C same)
hk transliteration by Sanscript