The HP 30S scientific calculator is a scientific calculator with over 250 built-in functions. Perfect for high school students. Constant mode Enhanced constant mode lets you change any combination of numbers, variables, functions and operators Decimal-to-fraction conversion function Equation solver function Helpful in scientific applications requiring trig and math functions Great for sine, cosine, tangent, exponential, natural log and antilog functions Enter operators and data in the order that would solve the problem as you would on paper From Buy.com for $14.99
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