![An open mathematics textbook rests on a wooden surface, viewed from a slightly angled, overhead perspective. The right-hand page is in focus, displaying various graphs of trigonometric functions and related problems. The left-hand page is partially visible and slightly out of focus.
The visible text, in Bulgarian, indicates exercises related to graphing functions. On the right page, a section titled "В интервала [0; 2π] начертайт" (In the interval [0; 2π] draw) lists three functions:
1. y = 1 + sin x
2. y = 3 sin x
3. y = -2 + sin x
Above these problems, another section discusses graphing techniques, mentioning "Графиката на функци" (The graph of the function) and operations like "чрез „разтягане по ост" (by "stretching along the axis") and "„вертикално нагоре“" (vertically upwards). One graph shows a sine wave labeled "y = sin x" with axes marked with values like 0, 1, -1, π, and 2π.
On the left page, text explains how a graph "се получава от графиката на функцията y₁ = sin x, която има същата абсциса и умножена по 2" (is obtained from the graph of the function y₁ = sin x, which has the same abscissa and multiplied by 2). A graph illustrating "2 sin x" is also visible.
The wooden surface suggests an indoor setting, likely a study environment. No people are visible, but the presence of the textbook implies an activity of studying or working on mathematics. The language and content are consistent with an educational context in Strelcha, Bulgaria.](https://firebasestorage.googleapis.com/v0/b/patr-3a75e.appspot.com/o/uploads%2Fimage_picker_10aeca10-c30e-4cfb-b.jpg?alt=media)
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An open mathematics textbook rests on a wooden surface, viewed from a slightly angled, overhead perspective. The right-hand page is in focus, displaying various graphs of trigonometric functions and related problems. The left-hand page is partially visible and slightly out of focus. The visible text, in Bulgarian, indicates exercises related to graphing functions. On the right page, a section titled "В интервала [0; 2π] начертайт" (In the interval [0; 2π] draw) lists three functions: 1. y = 1 + sin x 2. y = 3 sin x 3. y = -2 + sin x Above these problems, another section discusses graphing techniques, mentioning "Графиката на функци" (The graph of the function) and operations like "чрез „разтягане по ост" (by "stretching along the axis") and "„вертикално нагоре“" (vertically upwards). One graph shows a sine wave labeled "y = sin x" with axes marked with values like 0, 1, -1, π, and 2π. On the left page, text explains how a graph "се получава от графиката на функцията y₁ = sin x, която има същата абсциса и умножена по 2" (is obtained from the graph of the function y₁ = sin x, which has the same abscissa and multiplied by 2). A graph illustrating "2 sin x" is also visible. The wooden surface suggests an indoor setting, likely a study environment. No people are visible, but the presence of the textbook implies an activity of studying or working on mathematics. The language and content are consistent with an educational context in Strelcha, Bulgaria.
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