notebook with handwritten mathematical equations and a yellow book titled "ЧЕТИРИЗНАЧНИ МАТЕМАТИЧЕСКИ ТАБЛИЦИ И ФОРМУЛИ" (Four-Digit Mathematical Tables and Formulas) and "y=f(x)"
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Rako
Panagyuris..., Bulgaria
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"notebook with handwritten mathematical equations and a yellow book titled "ЧЕТИРИЗНАЧНИ МАТЕМАТИЧЕСКИ ТАБЛИЦИ И ФОРМУЛИ" (Four-Digit Mathematical Tables and Formulas) and "y=f(x)"" by Rako, licensed under CC BY 4.0
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notebook with handwritten mathematical equations and a yellow book titled "ЧЕТИРИЗНАЧНИ МАТЕМАТИЧЕСКИ ТАБЛИЦИ И ФОРМУЛИ" (Four-Digit Mathematical Tables and Formulas) and "y=f(x)"

PanagyurishteBulgaria

notebook with handwritten mathematical equations and a yellow book titled "ЧЕТИРИЗНАЧНИ МАТЕМАТИЧЕСКИ ТАБЛИЦИ И ФОРМУЛИ" (Four-Digit Mathematical Tables and Formulas) and "y=f(x)". A blue ballpoint pen is lying on the notebook. The equations involve quadratic expressions, solutions of quadratic equations, and a system of equations. Given the Cyrillic script on the book, the notebook, and the handwriting, the location is likely in Bulgaria.