Using scientific functions safely
A scientific calculator is useful for powers, roots, trigonometry and multi-step arithmetic. Use parentheses to make the intended order clear—for example, enter (2 + 3) × 4 when you want 20 rather than 2 + (3 × 4), which equals 14.
Angles and precision
- Check whether trigonometric functions expect degrees or radians before calculating sin, cos or tan.
- Keep extra digits during intermediate steps and round only the final result.
- Some expressions are undefined, such as division by zero; logarithms of non-positive real numbers also need special handling.
- For exams or engineering work, verify required mode and rounding rules against the calculator policy or specification.
Results are numerical aids and should be independently checked when used for safety-critical or high-stakes work.