Fototapeta The law of cosines in trigonometry formula on a black chalkboard. Area of a triangle. School. Math. Vector illustration.

The law of cosines  in trigonometry formula on a black chalkboard.  Area of a triangle. School. Math. Vector illustration.

Numer zdjęcia: 627533087, autor: © Олейник Александр

Tytuł: The law of cosines in trigonometry formula on a black chalkboard. Area of a triangle. School. Math. Vector illustration.

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