Rachii Trig

See how angles, the unit circle and trigonometric graphs connect on iPad and iPhone. Rachii Trig is a visual tool for classroom demonstrations and hands-on exploration. EXPLORE THE UNIT CIRCLE • Drag point P and watch the angle and values change together. • See all four quadrants with x = cos θ and y = sin θ. • Switch between degrees and radians, including inputs such as π/3. • Read fractions, radicals and approximate values, plus reference and coterminal angles. ALL SIX FUNCTION GRAPHS • View sin, cos, tan, sec, cosec and cot together. • Focus on one graph or compare several functions on shared axes. • Explore reciprocal pairs and graph periods. • Identify undefined values and breaks at vertical asymptotes. TOOLS FOR DEMONSTRATION • Write with pencil, pen and Apple Pencil on compatible iPads. • Point with a temporary laser, erase and undo strokes. • Circle and graph handwriting are saved separately on your device. • Use the key-angle table and presentation mode in portrait or landscape. Choose Thai, English, Simplified Chinese, Korean or Japanese inside the app. Core functions work offline. No account, advertising, subscription or in-app purchases. Designed for visual exploration, without lesson courses or exercise sets. Graphs use a limited vertical range; function cards show the numerical values.