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Scientific calculator 115 can perform exponent calculation, draw graph as 991 The calculator 991 ex contains following features: • Scientific calculator 115 can perform exponent calculation, draw graph, work as calculator es 115, calculate simple and advanced expression like 991 + 115 / 300 • Advanced calculator es 300 includes symbolic integration, calculate integral and perform advance calculation task. • 991 science calculator provides various tools for student such as LCM, GCD, random integer and solve equation. • Engineering calculator 115 es is a useful tools for engineering student to calculate fraction, convert fraction to decimal, calculate pi number and over 991 math functions • Barcode is also included in this app. • Smart calculator 300 es helps you solve homework better by calculating automatically without pressing equal button.