[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) › c8.54 # Mathematics in Ancient and Medieval India c8.54 Mathematics in Ancient and Medieval India c8.54 - **Language:** English ### [c8.54](https://indike.org/pramana/ins.science.bag-1979.c8.54) These two rules are equivalent respectively to our modern formulae : $Sin²A=½(1-Cos 2A) and Sin²A+Cos²A=1$ - [Previous: c8.53](https://indike.org/pramana/ins.science.bag-1979.c8.53) - [Next: c8.55](https://indike.org/pramana/ins.science.bag-1979.c8.55) - [Up: c8](https://indike.org/pramana/ins.science.bag-1979.c8) --- Source: [https://indike.org/pramana/ins.science.bag-1979.c8.54](https://indike.org/pramana/ins.science.bag-1979.c8.54) · Pramāṇa