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A grid-lined notebook page, filled with handwritten mathematical equations in blue ink, rests on a light beige textured surface. The equations include "11.03" and "2. A)" at the top left, followed by "y' = cosx + e^x". Subsequent lines detail the integration process: "y = ∫(cosx + e^x) . dx", "∫cosx . dx = sinx", and the final solution "y = sinx + e^x + C". A partial equation "y'' = lnx" is visible at the bottom. An elongated, bright light reflection appears on the surface above the notebook. The scene is located in Sofia, Bulgaria.
martolzrv

Mar 11, 2026

Sofia, Bulgaria

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A grid-lined notebook page, filled with handwritten mathematical equations in blue ink, rests on a light beige textured surface. The equations include "11.03" and "2. A)" at the top left, followed by "y' = cosx + e^x". Subsequent lines detail the integration process: "y = ∫(cosx + e^x) . dx", "∫cosx . dx = sinx", and the final solution "y = sinx + e^x + C". A partial equation "y'' = lnx" is visible at the bottom. An elongated, bright light reflection appears on the surface above the notebook. The scene is located in Sofia, Bulgaria.

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martolzrv

Mar 11, 2026

Sofia, Bulgaria

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