Answers are graded by value, not by spelling: any algebraically equivalent form
is accepted. (x+1)^2, x^2+2x+1 and x*x+2*x+1 all pass.
| x^2, x^(1/2), e^(-x) | powers — use parentheses on compound exponents |
| sqrt(x), cbrt(x), |x|, abs(x) | roots and absolute value |
| sin x, sin(x), sin^2(x) | trig — parentheses optional for a simple argument |
| sec, csc, cot, arcsin, arctan | also asin / acos / atan |
| ln(x), log(x), e^x, exp(x) | log means natural log in this game |
| sinh, cosh, tanh, sech | hyperbolic functions |
| pi, e | constants |
| 3x, 2(x+1), x y | implicit multiplication is fine |
| y = 2x - 1 | a leading "y =" or "f'(x) =" is ignored |
| + C | a trailing constant of integration is ignored |
| DNE, infinity, -infinity | type these as words when a limit fails to exist |
Each step is worth 10 XP: 10 for a clean first try, 7 after a hint, 4 after a wrong attempt, 0 if you reveal it. Stars per level: 3 stars at 90%, 2 at 70%, 1 otherwise. Progress is saved in this browser.