The image shows a page from a book with a drawing of a triangle and a circle, along with formulas and text written on it.
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The image shows a page from a book with a drawing of a triangle and a circle, along with formulas and text written on it. The text appears to be a trigonometric equation, which is a mathematical equation used to calculate the angle of a given angle. The drawing of the triangle and circle is composed of various shapes and lines, and the formulas are written in a neat and organized manner.