High School 2 mathematics
Step 8 covers High School 2. Nine activities from this grade are translated into English so far, with the same quizzes and best-score tracking as the Korean site — more High School 2 topics are on the way.
📈 Functions & graphs
Exponential & Logarithmic Functions
Change the base with a slider and see the exponential and logarithmic graphs reflect across y=x like a mirror.
Open English lesson → 📊Properties of Logarithms
Verify with real numbers how multiplication turns into addition, and a power turns into multiplication.
Open English lesson → 🎯Limits & Continuity of Functions
See how a function's value can be undefined while its limit still exists, and compare three types of discontinuity.
Open English lesson →🔢 Sequences & series
Arithmetic & Geometric Sequences
See Gauss's pairing trick and compound-interest growth to understand the sum formulas from the ground up.
Open English lesson → 🎯Limits of Sequences
Grow n very large and see whether a sequence converges to a value or diverges without settling down.
Open English lesson →📐 Trigonometry
Unit Circle & Trig Ratios
Rotate a point on the unit circle and watch its coordinates trace out the sin and cos waves.
Open English lesson → 📈Graphs of Trig Functions
Adjust amplitude, period, phase shift, and vertical shift to see how sin, cos, and tan graphs transform.
Open English lesson →🌀 Fun patterns