Graphing Sine and Cosine: Amplitude, Period and Phase Shift
Learn how A, B, C and D change the graph of y = A sin(Bx + C) + D, with worked examples for amplitude, period, phase shift and midline.
Trigonometry
3 guides.
Degrees and Radians: How to Convert and Why It Matters
What a radian is, how to convert between degrees and radians in exact π form, a table of common angles, and why calculus uses radians.
Sine, Cosine and Tangent Explained (SOHCAHTOA and the Unit Circle)
Learn what sin, cos and tan mean in right triangles and on the unit circle, the exact values for 30°, 45° and 60°, and the ASTC sign rule.