Graphic Display Calculator

Functions: abs, acos, acosh, asin, asinh, atan, atan2, atanh, cbrt, ceil, cos, cosh, cot, csc, deg, exp, fact, factorial, floor, gcd, hypot, lcm, ln, log, log10, log2, max, mean, min, mod, ncr, npr, pct, pow, rad, rem, root, round, sec, sign, sin, sinh, sqrt, sum, tan, tanh, trunc. Constants: e, phi, pi, tau. Also ! for factorial, ^ for powers, |x| for absolute value.
Applies to sin/cos/tan and their inverses. The CAS mode always works in radians, because the differentiation rules are only valid there.
Applied to the displayed result; the unrounded value is also returned.
Lets the expression use x as a variable, e.g. x^2 + 3x + 2.
Graphing mode: the left edge of the window. Solver mode: the left end of the bracket to search.
Graphing mode: the right edge of the window. Solver mode: the right end of the bracket to search.
Graphing mode: how many evenly spaced x values to sample, endpoints included.
Result
21
Scientific Calculator
Full-precision result
21
Result with separators
21
Scientific notation
2.100000000 x 10^1
Expression as parsed
x^2 - 4
Angle unit
rad
Result read as an angle, in degrees
1,203.21137
Result read as an angle, in radians
21
Smallest y in the window
-4
Largest y in the window
21
Worked out from NIST Digital Library of Mathematical Functions, Chapter 4 (Elementary Functions) and 4 other sources.

How this is worked out

3 steps
  1. Read as: x^2 - 4 with angles in radians.
  2. Sample y = f(x) at 11 evenly spaced points from x = -5 to x = 5 (step 1).
  3. y ranges from -4 to 21 over the window.
Step-by-step workingtable
f(-5) = 21, f(-4) = 12, f(-3) = 5, f(-2) = 0, f(-1) = -3, f(0) = -4, f(1) = -3, f(2) = 0, f(3) = 5, f(4) = 12, f(5) = 21
Value table for y = f(x)table
xy
-521
-412
-35
-20
-1-3
0-4
1-3
20
35
412
521

Results are general information, not financial, tax, legal, medical or engineering advice.