Calculator CASIO FX 991 ES PLUS 2E:Do you want to make sure your calculations are correct? Youll need the CASIO FX 991 ES PLUS 2E calculator. The Scientific calculator easily performs more complex calculations, which makes it a great choice for students of secondary schools and universities. It has 417 functions, that cover all types of mathematics in the standard curriculum. The calculators basic functions include with square roots, with percentages, with brackets, last responce and recovery. The CASIO FX 991 ES PLUS 2E will also solve derivatives and integrals, logarithmic functions, or trigonometric functions. The advantage of this variant, is that it has both a solar panel and battery, which saves power. It uses dot display technology. Its packaging includes a protective case that will keep it from getting scratched up. Its dimensions are 16,2 × 7,7 × 1,1 cm. CASIO FX 991 ES PLUS 2E Calculator Key Features Scientific calculator will save you time spent doing calculations 417 functions Powered by both solar and battery powered Model weighs 95 g Automatically shuts down to save energy Scientific functions of calculator: trigonometric functions Sin, Cos, Tan, Cotg, with fractions, logarithmic functions, complex numbers, derivatives and integrals, calculations in DEC, BIN, OCT, HEX, PEN, solving linear equation systems and natural-looking calculation display