The TI-36X Pro is one of my all-time favorite calculators. Some great features of this calculator are that it can

• Solve two-step equations, like 3x-3 = 12

• Solve polynomial equations, like 2x^2+4x-12=0

• Solve systems of linear equations in 2 and 3 dimensions

• One-button switch between fraction/decimal, pi/decimal, and square root/decimal answers

• Logarithms with a base other than e or 10

• Derivatives