Powers and roots
An exponent such as 3^4 means multiplying 3 by itself four times, giving 81. The square root of a positive number is the nonnegative value whose square equals that number.
Scientific calculations — Guide
Guidance for Scientific Math Calculator. Practical instructions, limitations, and accuracy tips.
This article explains the use and limitations of the interactive tool. No signup is required. Output can be approximate and should not substitute for authoritative sources when the stakes are high.
Trigonometry
Scientific functions use angle conventions. The quick examples supplied here use radians; 30 degrees is π/6 radians and its sine is approximately 0.5.
Precision
Floating-point results are approximations; for exact symbolic manipulation, a computer algebra system is required.