Mathematics in Ancient and Medieval India c8.41

c8.41

Bhāskara I¹ has given several other formulae which may be given without proof as follows : $R Sin (90⁰ + A) = R Sin 90⁰ - R versin A$ $R Sin (180⁰ + A) = 90⁰ - R versin 90⁰ - R Sin A$ $R Sin (270⁰ + A) = R Sin 90⁰ - R versin 90⁰$ $- R Sin 90⁰ + R versin A where A < 90⁰$