• Use the "=" key to evaluate arithmetic expressions like 2*(3+4)/5 entered into the window. No operations are allowed other than (+ - * /) and no function can be entered in this field.
• To evaluate something like (2+sin(30))²,
  • enter 30
  • press the sin(button)
  • enter +
  • enter 2
  • press the ^2(button)
• The trig functions accept only degrees
• The ^2,^3,sqrt,exp , ln, and memory keys accept regular number expressions (e.g., 3.14) and scientific notation (e.g., 3.14e-2), all other entries use regular number expressions only.
• The ln(button) is the natural logarithm, to obtain the log to the base 10 divide the ln(button) result by 2.303.

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