ത്രികോണമിതി കണ്ടുപിടിച്ചതാര്
Aപൈതഗോറസ്
Bഫൈയിൽസ്
Cയൂക്ലിഡ്
Dഹിപ്പാർക്കസ്
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പെട്രോൾ എൻജിൻ കണ്ടുപിടിച്ച ശാസ്ത്രജ്ഞൻ ആരാണ് ?