Why do I see “undefined” for some inputs?
Certain functions, like logarithms of negative numbers or tangent at 90° in degrees, are undefined in real numbers. The calculator flags these cases instead of returning NaN.
Step-by-step walkthrough
Scientific Calculator Guide
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Before you start
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
- sin
- cos
- tan
- log
- exp
Detailed procedure
Step 1
Pick the desired scientific function from the Operation dropdown.
Step 2
If you selected sin, cos, or tan choose whether the input angle uses degrees or radians.
Step 3
Enter the primary value (and exponent when using xʸ). The output updates automatically.
Teaching & troubleshooting tips
Can I switch between degrees and radians?
Yes. When you pick a trig function, an angle mode selector appears so you can flip between degrees and radians instantly.