The Scientific Calculator 300 Plus, 991 is a powerful tool for students and engineering students. It includes several calculators such as the Basic Calculator 300 Plus, Advanced Calculator 115 Plus, Scientific Calculator 991, Scientific Calculator 991 Plus, and Graphing Calculator 84 Plus. The Basic Calculator 300 Plus and 115 Plus support basic and advanced math functions, including percentage, powers, roots, trigonometric, logarithms calculator, and fraction calculation. The Advanced Calculator 115 Plus combines a hyper calculator and simple scientific calculator, making it a multi-functional advanced calculator with all features in one app.

The Scientific Calculator 991 Plus includes a smart equation solver that can solve quadratic, cubic equations, systems of equations, and any polynomial. It also contains scientific calculations such as derivative, integral, square root calculation, factorial calculation, pi calculation, and equation solver. The Scientific Calculator 991 supports calculating with an infinite number of digits, prime factors, random numbers, combinations, permutations, GCD, and LCM. It is a real engineering simulator with features of 500 es, 500 ms, 300 es plus, and 991 es plus.

The Graphing Calculator 84 Plus supports function graph, polar, parametric, and implicit function. It can draw tangent, tracing, derivative, root, min, and max. It simulates for graphing calculator 83 and t1 84, 84 plus. The Integral Calculator 991 Plus provides a powerful calculator to calculate integrate, derivative, differentiation, and integration. The Scientific Calculator 991 includes CAS (computer algebra system), which can perform symbolic calculation. Other features include math formula, physics formula, unit conversion, theme, font, and programming.

In summary, the Scientific Calculator 300 Plus, 991 is a comprehensive tool for students and engineering students. It includes several calculators with powerful functions such as equation solver, scientific calculations, and graphing capabilities. It also supports basic and advanced math functions, fraction calculation, and symbolic calculation. Other features include math and physics formulas, unit conversion, and programming.