[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Science, technology and education](https://indike.org/pramana/ins.science) › [Mathematics in Ancient and Medieval India](https://indike.org/pramana/ins.science.bag-1979) › c8.41 # Mathematics in Ancient and Medieval India c8.41 Mathematics in Ancient and Medieval India c8.41 - **Language:** English ### [c8.41](https://indike.org/pramana/ins.science.bag-1979.c8.41) Bhāskara I¹ has given several other formulae which may be given without proof as follows : $R Sin (90⁰ + A) = R Sin 90⁰ - R versin A$ $R Sin (180⁰ + A) = 90⁰ - R versin 90⁰ - R Sin A$ $R Sin (270⁰ + A) = R Sin 90⁰ - R versin 90⁰$ $- R Sin 90⁰ + R versin A where A \< 90⁰$ - [Previous: c8.40](https://indike.org/pramana/ins.science.bag-1979.c8.40) - [Next: c8.42](https://indike.org/pramana/ins.science.bag-1979.c8.42) - [Up: c8](https://indike.org/pramana/ins.science.bag-1979.c8) --- Source: [https://indike.org/pramana/ins.science.bag-1979.c8.41](https://indike.org/pramana/ins.science.bag-1979.c8.41) · Pramāṇa