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Bhaskara wrote two treatises, the Mahabhaskariya (Great book of Bhaskara ) and the Laghubhaskariya (Small book of Bhaskara). He also wrote commentaries on the work of Aryabhatta I entitled Aryabhatiyabhasya. The Mahabhaskariya comprises of eight chapters dealing with mathematical astronomy. The formula which Bhaskara gives is amazingly accurate and use of the formula leads to a maximum error of less than one percent. The formula is :
Sine x = 16x ( ð – x ) / [ 5 ð2 – 4x ( ð – x) ]
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Bhaskara perpetual motion wheel.