Texas Instruments TI-30XS MultiView Scientific Calculator

• Designed with unique features to allow you to enter more than one Calculation, compare results and explore patterns, all on the same screen.
• Enter and view calculations in common math notation via the math Print mode, including stacked fractions, exponents, exact square roots and more.
• Quickly view fractions and decimals in alternate forms by using the toggle key.
• Scroll through previous entries and investigate critical patterns as well as viewing and pasting into a New Calculation.
• Explore an x, y table of values for a given function, automatically or by entering specific x values.Up to 23 levels of parentheses
• https://www.amazon.com/Texas-Instruments-MultiView-Scientific-Calculator/dp/B000PDFQ6K/ref=sr_1_31?qid=1567337314&s=electronics&sr=1-31