Check angle modes, precedence, and graph estimates

Try three checks with known outcomes

Enter 2+3*4 and calculate: expect 14. Enter (2+3)*4: expect 20. Powers group from the right, so 2^3^2 gives 512. Use * for multiplication, not implied 2pi.

Choose DEG and calculate sin(30): expect 0.5. Choose RAD and calculate sin(pi/2): expect 1. Changing angle mode clears the displayed result; calculate again. Percent means divide the previous value by 100: 200*10% gives 20, but 200+10% gives 200.1, not a percentage increase.

Tools used in this section

• Scientific Calculator — Enter and verify expressions locally, or plot one explicit function of x.

Know when not to trust a plotted point

Plot x^2 in Graph mode and inspect its shape near x=2; calculate 2^2 in Calculator mode to verify the numeric answer 4. A plotted pixel near y=4 is not an exact coordinate. Narrow spikes and steep changes can be missed by sampling.

sqrt(-1) reports a real-number domain error rather than a complex answer. Factorials accept whole inputs through 170. If an expression fails, check parentheses, explicit multiplication, angle mode, and the real-number domain. For consequential calculations, check rounding and use an independent precision method.

Continue learning

Browse every RizzKit guide or use the linked tool pages to review exact processing details, examples, and limitations before starting.