[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) › c8.32 # Mathematics in Ancient and Medieval India c8.32 Mathematics in Ancient and Medieval India c8.32 - **Language:** English ### [c8.32](https://indike.org/pramana/ins.science.bag-1979.c8.32) R Sin (90º + A) = R Sin (90º – A) = R Cos A R Sin (180º + A) = – R Sin A R Sin (270º + A) = – R Sin (90º – A) = – R Cos A where A90º - [Previous: c8.31](https://indike.org/pramana/ins.science.bag-1979.c8.31) - [Next: c8.33](https://indike.org/pramana/ins.science.bag-1979.c8.33) - [Up: c8](https://indike.org/pramana/ins.science.bag-1979.c8) --- Source: [https://indike.org/pramana/ins.science.bag-1979.c8.32](https://indike.org/pramana/ins.science.bag-1979.c8.32) · Pramāṇa