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Scientific calculator performs 131 functions and features a large 10-digit LCD numeric screen, one memory and one variable statistic. Functions include complex number calculations, percent, sin, cos, tan, sinh, cosh, tanh, square root and more. The hard cover protects the calculator so it can withstand frequent use. Calculator is recommended for general math, pre-algebra, algebra and trigonometry. PTA-approved tests include AP Chemistry, AP Physics, PSAT/NMSQT, SAT I, SAT II, Math IC, and Math IIC. Calculator is battery-powered.