The product is a vintage Texas Instruments Advanced Scientific TI-81 Graphics Calculator Guidebook, published in 1992 by Texas Instruments Inc. Books. This illustrated paperback book, measuring 5 1/2 inches in length, 8 inches in height, and 3/8 inches in width, is an activity book focused on mathematics. It is intended for young adults and adults interested in mathematics, sciences, engineering, and technology. The guidebook provides information on the TI-81 Graphical Calculator and is written in English, making it a valuable resource for those looking to enhance their understanding of mathematical concepts.
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