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Texas Instruments Ti Sec 84 Color Screen Graphing Calculator . Graph in vibrant colors to make faster, stronger connections. I would strongly recommend people compare with casio graphing calculators, especially in regards to the computational speed. Calculators from buydirect.missionlinen.com Explore math expressions in symbolic form, see patterns, and understand the math behind the formulas. The casio absolutely blows away the ti in calculation speed. Available in a variety of fun colors.