Trigonometry
SOH-CAH-TOA
sin θ = opposite/hypotenuse | cos θ = adjacent/hypotenuse | tan θ = opposite/adjacent
Key Identity
sin²θ + cos²θ = 1
Complementary Angles
sin(x) = cos(90° - x) and cos(x) = sin(90° - x)
Unit Circle Basics
sin = y-coordinate, cos = x-coordinate
Know values for 0°, 30°, 45°, 60°, 90°
SAT Tips
The SAT provides trig formulas in the reference box
Most trig questions involve right triangles or the unit circle
Complement relationship is a favorite SAT question type
Convert between degrees and radians as needed