Mathematics

Trigonometry Study Guide

Right-triangle and unit-circle trig, identities, equations, and applications to waves and vectors.

Core topics in Trigonometry

Identities are the killer. Students who only memorize SOH-CAH-TOA hit a wall in precalc when sum-to-product identities appear.

Fennie drills identity-recognition: given an expression, predict which identity simplifies it before you apply it.

Yes — every higher math course assumes you can call up sin and cos of standard angles instantly.

Stop memorizing all of them. Derive them from Pythagorean identity and the angle-sum formula.

Yes — Fennie generates identity-proof problems and grades each step.

Upload your notes, syllabus, or textbook. Fennie builds a Daily Plan in under a minute and rebalances daily based on your performance.

Foundational algebra — variables, equations, inequalities, functions, polynomials, and the gateway to higher math.

Euclidean geometry — points, lines, triangles, circles, proofs, and analytic geometry.

Bridge to calculus — advanced functions, sequences and series, limits, conic sections, and analytic trigonometry.

Limits, derivatives, applications of derivatives, and an introduction to integration — single-variable calculus.