Trig·Mastery
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Pre-Calculus · Trigonometry

Master Trig
from the ground up.

20 carefully designed questions covering every key topic — with memory keys and instant feedback.

🔑 Quick Memory Keys — Study These First
📐 SOH‑CAH‑TOA · sin/cos/tan ratios
🔄 CAST rule · sign by quadrant
🆔 sin²+cos²=1 · Pythagorean ID
↔️ co-function · sin↔cos, tan↔cot
🌀 2π = 360° · unit circle period
⚡ double-angle · cos2θ has 3 forms
📏 arc = rθ · radians matter!
🔺 Law of Sines · a/sinA = b/sinB
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